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Verified: September 2026

Car Insurance Research: Household Drivers & Underwriting

Can a Car Insurance Company Add a Driver to Your Policy Without Your Permission?

Last Verified: September 2026Independent Research Report

A letter shows up from your insurer naming someone you never mentioned on the application — your kid who just passed the road test, the partner who moved in last spring, the roommate whose mail started arriving in March. The letter does not ask whether that person drives your car. It says the company has identified them as a driver at your address and gives you a window to respond. Which raises the question the letter never answers directly: can a car insurance company add a driver without your permission?

In the two states whose regulators have published on this, effectively yes. Maryland says an insurer may collect premium under its filed rating rules for every licensed driver residing in your home unless that person is specifically excluded, and New York says an insurer may charge additional premium — including retroactively — for a licensed household driver who should have been listed. Whether your own insurer may change an in-force policy, and whether you can exclude the driver instead, is set by your policy and the law of the state that governs it. The leverage does not come from a clause buried in the fine print. It comes from permissive use: a resident who drives your car with your permission is already an insured for liability under the policy you are paying for.

That is the part most drivers miss, and it changes the whole shape of the argument. A standard auto policy does not cover a list of names; for liability purposes it covers the car and nearly everyone who drives it within the scope of the named insured’s permission. Your insurer is exposed to the new licensee down the hall every time they drive with your permission, whether or not the company knows their name — which is why the Maryland and New York regulators let it charge for them. Physical damage to your own car is a separate question with a different answer. The rest of this report traces that chain: the liability coverage that creates the exposure, the screening tools that surface the driver, the part of your own coverage that quietly disappears when a resident goes unlisted, and the narrow set of options a notice letter actually gives you.

Research Summary

Three Figures That Explain the Letter

All Residents
Whose Premium the Insurer May Collect

Maryland’s regulator states an insurer may charge under its filed rating rules for every licensed driver in the home, learner’s permit holders included, unless that person is specifically excluded. [1]

$29 Billion
Industry Estimate of Premium Leakage

Verisk describes premium leakage — missing or misstated underwriting information — as “at least a $29 billion problem for the personal auto insurance industry.” That number is why the screening tools exist. [11]

Nearly 3×
Teen Fatal Crash Rate Per Mile

The CDC reports drivers aged 16–19 have a fatal crash rate almost three times as high as drivers aged 20 and older per mile driven, with risk highest in the first months of licensure. [13]

Your Liability Coverage Already Reaches People You Never Listed

Start with what the contract actually does. The Texas Department of Insurance describes the standard product plainly: a typical personal auto policy “provides coverage to almost everyone who drives the covered vehicle, unless specifically excluded.”[8] The named insured is not the boundary of coverage. The named insured is the person who signs and pays.

New York puts the same rule in regulatory text. Under Regulation 35-A, an auto liability policy must insure the named insured, a resident spouse, and “any other person using the motor vehicle with the permission of the named insured or such spouse provided his or her actual operation or other actual use thereof is within the scope of such permission.”[4] North Carolina’s Department of Insurance frames it through the family-member definition: a person related to you by blood, marriage, or adoption who resides in your household is an insured under the policy, and those family members should be listed as drivers on it.[3]

Follow that forward and the insurer’s position becomes arithmetic rather than attitude. The newly licensed 17-year-old down the hall does not need to be added to the declarations page to reach the liability coverage — under the New York rule quoted above, driving the car within the scope of the named insured’s permission is what makes them an insured. The company is then exposed to that driver’s crash rate, which the CDC measures at nearly three times the fatal-crash rate of drivers 20 and older per mile, concentrated in the first months of licensure.[13] The liability exposure attached without a signature. The premium did not. Closing that gap is what the letter is for. Note that disclosure and physical-damage coverage are a separate matter, covered below.

For the full mechanics of who is covered when someone else takes the wheel — including the difference between a first-class and second-class insured — see our companion research on who can drive your car under your insurance and on whether insurance follows the car or the driver.

What a Regulator Says the Insurer May Actually Do

The clearest statement comes from the Maryland Insurance Administration, which published a consumer advisory after fielding inquiries about exactly this scenario. An insurer, it says, “is entitled to collect premiums in accordance with its filed rating rules for all licensed drivers (including those with learner’s permits) residing in the policyholder’s home, unless the driver has been specifically excluded from the insurance policy.”[1] Read the sentence structure: collecting the premium is the default, and the exclusion is the carve-out you have to affirmatively obtain.

The phrase “filed rating rules” is doing quiet work there. The National Association of Insurance Commissioners describes pricing as two separate steps: underwriting, where a company decides whether to accept a risk, and rating, the mathematical process of pricing it once accepted — with each company using its own rating plan.[15] The insurer is not improvising a surcharge when it adds your household member. It is applying a rate structure it already filed with the state, to a person the state agrees it may charge for.

New York goes a step further on timing. The Department of Financial Services has advised that an insurer “may charge additional premium (including retroactively on a personal lines automobile insurance policy) to cover a licensed driver in the household who should have been, but was not, listed on the policy.”[4] That is the mechanism behind a back-dated bill: the company is not fining you for the omission, it is collecting the premium the risk should have generated during the months it went unpriced.

Washington’s Office of the Insurance Commissioner states the consequence side of the same rule for policyholders: insurance companies can deny coverage for claims if a licensed driver in your home is not listed on your policy, and many insurers require notification when a household driver’s status changes.[2]

Read those together and the limit is as important as the rule. Maryland and New York are two states’ regulators describing premium their own filed-rate systems allow. Neither one announces a 50-state rule, and neither one dispenses an insurer from the notice, endorsement, renewal, and policy-form requirements that apply where your policy was issued. If you want to know what your carrier may do to your in-force contract, the governing documents are your policy and your state’s insurance code — the regulator sample below is a starting point, not a substitute.

How a Company Learns Who Lives at Your Address

The honor system stopped carrying this load a long time ago. LexisNexis Risk Solutions sells a product called Driver Discovery whose stated purpose is identifying potential additional drivers in a household who may not have been disclosed. It ships in two forms: Additional Driver Discovery, which covers all 50 states plus the District of Columbia, and Youthful Driver Discovery, which alerts a carrier to newly licensed people aged 15 to 25 in select states.[10]

Verisk sells a competing screen. RISK:check Point of Sale scores an application with predictive analytics and validates four categories of detail — identity, garaging, household, and vehicles — where the household check is described as identifying “unlisted drivers, education, and occupation.”[11] The business case is stated in the same document: premium leakage, defined there as missing or misstated underwriting information, is “at least a $29 billion problem for the personal auto insurance industry.”[11]

There is an important legal wrinkle in how these screens may be used, and it cuts in the consumer’s favor more than most summaries admit. The federal Fair Credit Reporting Act defines a “consumer report” as a communication bearing on a consumer’s creditworthiness, character, general reputation, personal characteristics, or mode of living that is used or expected to be used to establish eligibility for credit or insurance, employment, or another permitted purpose.[12] LexisNexis states in its own product documentation that Driver Discovery “does not constitute a ‘consumer report’ as that term is defined in the federal Fair Credit Reporting Act” and “may not be used in whole or in part as a factor in determining eligibility for credit, insurance, employment or another permissible purpose under the FCRA.”[10]

LexisNexis adds its own instruction in the same documentation: “Before relying on any data, it should be independently verified.”[10] By the vendor’s own terms, then, the screen is a lead rather than a verdict — which is a plausible reason the letter gives you a response window instead of simply changing the bill. What the insurer may then do with your answer, and what documentation it has to accept, is governed by the policy and your state’s law, not by the vendor’s disclaimer. The practical move is to ask the insurer in writing what information it relied on and what proof it will take.

The Coverage You Lose Is Your Own Car

Drivers who hide a household member usually picture the downside as a denied liability claim — the injured stranger, the lawsuit, the ruin. That is generally the part that survives. Because permissive-use coverage is written into the policy and, in New York, mandated by regulation, liability protection for the other party is normally intact when an unlisted driver was using the car within the scope of the named insured’s permission.[4]

The exposure sits on the other side of the ledger. The Maryland advisory is explicit that while your policy “generally provides liability coverage for you and any driver that is not specifically excluded,” your “collision and comprehensive coverage may not be available if an accident occurs involving an undisclosed driver who is living in your home even when the driver has a reasonable belief they are permitted to use your vehicle.”[1] Some policy forms carry language that excludes physical-damage coverage on exactly those facts, and whether yours does depends on its specific wording.[1]

Picture how that lands. Your 19-year-old, who lives at home and was never added, slides through an intersection and totals the family sedan. The other driver’s bumper and medical bills are handled. Your own $24,000 car is a loss you eat, because the collision coverage you paid for every month was written to respond to disclosed residents. The savings from leaving the teen off the policy get erased in a single afternoon.

Maryland closes its advisory with the operational instruction that follows from all of this: notify your insurer of every licensed driver living in your home “even if that individual has their own car and insurance policy.”[1] Their separate policy protects them. Disclosure is what protects your vehicle.

The Four Ways a Notice Letter Can End

A driver-discovery notice is not a bill. It is a fork. Most carriers set out the same short menu, and each branch resolves the underwriting question a different way. The deadline printed on the letter controls which branch you get: respond and you choose, let it lapse and the insurer chooses for you.

Response Paths, With the Regulatory Basis for Each

What Each Answer to a Driver-Discovery Notice Does

ResponseWhat Happens MechanicallyThe Trade-Off
Rate the driver onto the policyThe insurer applies its filed rating rules to the newly identified resident and recalculates the premium. Maryland regulators describe this as the insurer’s baseline entitlement: it may collect premium for every licensed resident, including permit holders, unless that person is specifically excluded.The household keeps full coverage. The premium reflects the actual risk, which for a newly licensed teen can be a large increase.
Show the driver carries their own policyYou send the insurer the other person’s declarations page showing they carry their own coverage. Whether that changes the insurer’s rating or its requirement to list the resident depends on its filed rules, your policy, and state law — no cited regulator says separate coverage removes a current resident from the household rating.Maryland regulators still direct you to notify the insurer of a licensed resident "even if that individual has their own car and insurance policy," because physical-damage coverage on your own car can turn on whether the resident was disclosed — not on whether they carry insurance elsewhere.
Sign a named driver exclusionA signed endorsement strikes one specific person from the policy. The insurer stops rating them, which holds the premium down.Availability is set by state law. New York does not permit a restriction on who may drive for liability purposes, and has approved a collision-only exclusion only rarely and only with the insured’s signed acknowledgment.
Do nothing and let the notice expireThe insurer proceeds on the information it already has and rates the driver onto the policy at the next renewal or endorsement date.You absorb the premium change without choosing among the other three paths, and you may also face a retroactive charge covering the period the driver went unreported.
Compiled from state regulator guidance on household drivers and driver exclusions.[1] [4] [5] Notice periods and available options are set by your own policy and state law, not by a single nationwide rule.Verified: September 2026

Excluding the Driver Is Not a Universal Escape Hatch

The exclusion looks like the cheap answer, and in several states it is available. But it is a state-regulated instrument, not a customer preference, and two states illustrate how differently the line gets drawn.

New York bars the obvious version outright. Under Regulation 35-A, an insurer of a policy subject to Insurance Law § 3425 may not impose a restriction on who may drive a covered vehicle for liability coverage purposes; an endorsement saying the company will not be liable for losses occurring while a specifically named person drives violates that regulation.[6] The Department has approved a narrower version — excluding collision coverage for one named driver — only “on rare occasion,” and only where the insured signs an acknowledgment that collision coverage is not provided when that specific individual drives.[5]

Texas attacked a different product. Insurance Code § 1952.0545 defines a “named driver policy” as “an automobile insurance policy that does not provide coverage for an individual residing in a named insured’s household specifically unless the individual is named on the policy,” including a policy endorsed to cover only drivers specifically named on it.[8] House Bill 259 then prohibited insurers from delivering, issuing for delivery, or renewing those policies on or after January 1, 2020, with the Department instructing that no insurer should have any named driver policy in force after December 31, 2020.[7]

Keep the two concepts apart, because they are routinely conflated. A named driver policy covers only the people named on it and leaves every other resident uninsured. A named driver exclusionis a single carve-out attached to an otherwise standard policy that still covers the household. Texas regulators drew that line explicitly: a policy providing coverage for all residents of the insured’s household is not a named driver policy even if it excludes one or more drivers by name.[8] Banning the first does nothing to the second.

Borrowing the Car Once Is Not the Same as Using It

None of this means every person who ever touches your steering wheel belongs on the declarations page. The friend who borrows the truck for one Saturday move is the classic permissive user, covered by the policy and irrelevant to the rating. The category that matters to underwriters is the person with standing access — the resident, or the outsider who drives the car on a recurring basis.

Insurers draw that boundary with “regular use” language, and whether a given clause survives a challenge depends on its wording, the coverage it limits, and the state law that governs it. One recent example runs in the insurer’s favor. In Eberly v. LM General Insurance Co., decided August 1, 2024, the Third Circuit considered whether a regular-use exclusion barring underinsured motorist coverage for injuries sustained in a non-owned vehicle furnished for the insured’s regular use violated Pennsylvania’s Motor Vehicle Financial Responsibility Law. The court concluded it did not and affirmed the denial of benefits.[14] The disposition states on its face that it “does not constitute binding precedent,” it turns on Pennsylvania law, and it concerns underinsured motorist coverage rather than the liability coverage and household rating at issue in a driver-discovery notice. Treat it as one illustration of how a court read one clause, not as authority that regular-use exclusions are generally enforceable.

The practical test an underwriter applies is frequency and access, not affection. If a person can take the keys on an ordinary weekday without asking, the insurer will want them rated. If they need to call first and it happens twice a year, they are a borrower.

Five Jurisdictions, Five Different Emphases

Auto insurance is regulated state by state, and the published guidance below is a verified sample rather than a 50-state survey. Each entry links to the issuing department’s own document so you can read the language yourself before you respond to a notice.

Selected State Examples: Not a 50-State Survey

Published Regulator Positions on Unlisted Household Drivers

JurisdictionPublished PositionWhat the Source SaysAuthority
MarylandInsurer may collect premium for every licensed residentThe Maryland Insurance Administration states an insurer "is entitled to collect premiums in accordance with its filed rating rules for all licensed drivers (including those with learner’s permits) residing in the policyholder’s home, unless the driver has been specifically excluded from the insurance policy."MIA Consumer Advisory [1]
New YorkRetroactive premium allowed; liability exclusion is notThe Department of Financial Services has advised that an insurer may charge additional premium, including retroactively, to cover a licensed household driver who should have been listed. Separately, Regulation 35-A bars restricting who may drive for liability purposes, and a collision-only exclusion has been approved only rarely and only with a signed acknowledgment.NY DFS OGC Opinions; 11 NYCRR § 60-1.1 [4] [5]
TexasNamed driver policies prohibited; named exclusions are a separate thingInsurance Code § 1952.0545 defines a named driver policy as one that does not cover a resident of the household unless that person is named. House Bill 259 barred insurers from delivering, issuing, or renewing those policies on or after January 1, 2020. A standard policy that covers household residents is not a named driver policy even if it excludes one driver by name.Tex. Ins. Code § 1952.0545; TDI Bulletin B-0010-19 [7] [8]
North CarolinaResident family members are insureds and should be listedThe Department of Insurance explains that a "family member" — a person related to you by blood, marriage, or adoption who resides in your household — is insured under the policy, and that these family members should be listed as drivers on it.NC DOI consumer guidance [3]
WashingtonAn unlisted resident driver can cost you the claimThe Office of the Insurance Commissioner warns that insurance companies can deny coverage for claims if a licensed driver in your home is not listed on your policy, and notes that many insurers require notification when a household driver’s status changes.WA OIC consumer guidance [2]
Compiled from official state insurance department publications; each jurisdiction’s rule has its own scope and conditions described in the primary source.Verified: September 2026

The Screen Built Around Teen Drivers

LexisNexis sells Youthful Driver Discovery as its own product line, marketed as revealing newly licensed drivers aged 15 to 25 who may not have been disclosed by the applicant — a narrower slice of the household than the general screen targets.[10] The underlying safety data explains the pricing. The CDC reports that the crash rate per mile driven is about 1.5 times as high for 16-year-old drivers as for 18- and 19-year-olds, and that drivers aged 16 to 19 have a fatal crash rate almost three times that of drivers 20 and older per mile.[13]

The permit stage is the grace period, and states treat it as such. The Texas Department of Insurance tells parents they are not legally required to carry insurance for a teen holding a learner’s permit, but that they “should always let your insurance company know if a teen is learning to drive in your vehicle,” and that failing to notify can end with a denied claim, a voided policy, or a refused renewal.[9] Maryland removes the ambiguity entirely by naming permit holders in the set of licensed drivers an insurer may charge for.[1]

Households weighing whether to keep a young driver on the family policy or move them onto their own should read our companion research on whether a 17-year-old can get their own car insurance and on how student status changes a premium, since a student-away discount generally requires the student to stay listed rather than be removed.

What to Do When the Notice Arrives

Read the deadline first, then the accusation. The window on the letter is the only part that is time-sensitive. Missing it hands the decision to the underwriter, who will resolve the file with the information already in hand.

Correct a wrong identification in writing.Household screens work from address data, and a former tenant, an adult child who moved out, or a relative who receives mail at your address can surface incorrectly. Send documentation of the person’s actual residence and keep a copy.

If the person really does live there, send their declarations page. Proof of separate coverage is the cheapest answer on the menu, but it is not automatically an exit: whether it changes your rating is a matter of the insurer’s filed rules and your state’s law. Send it as a disclosure, not as a substitute for one, because Maryland’s advisory still directs you to notify your insurer of a licensed resident even when they carry their own policy.[1]

Ask specifically about physical damage before you sign an exclusion. The question that matters is not whether the exclusion lowers the premium. It is what happens to collision and comprehensive on your own vehicle if that person drives it, and whether your state permits the exclusion at all.[5]

Price the alternative before you accept the increase. A newly rated household driver is exactly the kind of change that makes a policy uncompetitive, and the market prices teen drivers very differently from one carrier to the next. See our companion research on how often you should shop for car insurance for the timing mechanics, and on what you need to apply for car insurance for the household information a new application will ask for anyway.

Frequently Asked Questions

Can a car insurance company add a driver without your permission?

In Maryland and New York, in substance yes. Maryland’s insurance regulator states that an insurer is entitled to collect premium under its filed rating rules for all licensed drivers residing in the policyholder’s home, including learner’s permit holders, unless that driver has been specifically excluded from the policy. New York’s Department of Financial Services has likewise advised that an insurer may charge additional premium — including retroactively — to cover a licensed household driver who should have been listed and was not. Those are two states’ regulators, not a nationwide rule: whether your insurer may list the driver, amend an in-force policy, or bill retroactively is governed by your policy and the law of the state that issued it.

How does an insurance company find out someone lives at my address?

Through household-screening products. LexisNexis Risk Solutions sells Driver Discovery, which identifies potential additional drivers in a household across all 50 states and D.C., plus a Youthful Driver Discovery version that flags newly licensed people aged 15 to 25 in select states. Verisk’s RISK:check Point of Sale scores an application and validates a "Household" category that identifies unlisted drivers.

Can the insurer bill me retroactively for a driver I never reported?

In New York, yes. The Department of Financial Services has stated an insurer may charge additional premium, including retroactively on a personal lines automobile policy, to cover a licensed driver in the household who should have been, but was not, listed on the policy. Rules vary by state, so confirm with your own insurance department.

What happens to my claim if an unlisted household driver crashes my car?

Liability coverage for the other party is usually still there, because standard policies cover permissive users. Your own car is the exposure. The Maryland Insurance Administration warns that collision and comprehensive coverage may not be available when an undisclosed driver living in your home is involved, even if that driver reasonably believed they were permitted to use the vehicle.

Can I just exclude the driver instead of paying more?

Sometimes, and it depends on the state. New York does not permit an insurer to restrict who may drive a covered vehicle for liability purposes under Regulation 35-A, and has approved a collision-only exclusion only on rare occasion and only with the insured’s signed acknowledgment. Texas separately prohibits insurers from issuing or renewing named driver policies on or after January 1, 2020.

Do I have to list a roommate or an adult child who lives with me?

Regulators frame the duty around residency, not relationship. Maryland’s advisory covers all licensed drivers residing in the home, and tells policyholders to notify the insurer even if that person has their own car and their own policy. Ask your insurer how it treats a licensed resident who is not a relative.

Does a friend who borrows my car once need to be added?

No. A one-off borrower is a permissive user and is generally covered without being listed — New York’s Regulation 35-A requires liability coverage for any person using the vehicle within the scope of the named insured’s permission. The categories that draw underwriting attention are household residents and people who use the car on a recurring basis.


Legal Disclaimer

This content is provided for informational and educational research purposes only. It does not constitute legal, financial, or insurance advice and does not create an attorney-client relationship. This report covers general principles plus a selected set of verified state examples; it is not a complete 50-state legal survey, and it does not cover U.S. territories or foreign law. Statutory text, regulatory opinions, and insurer rating plans are subject to change; verify current rules with your insurer, a licensed insurance producer, or your state’s department of insurance before making a coverage decision.

Primary Source Directory

  1. Consumer Advisory: Licensed Drivers in Your Household (Official): Maryland Insurance Administration. States that an insurer may collect premium under its filed rating rules for all licensed drivers, including permit holders, residing in the policyholder’s home unless specifically excluded, and that collision and comprehensive coverage may be unavailable for a claim involving an undisclosed resident driver.
  2. Auto Coverage for Teen Drivers (Official): Washington State Office of the Insurance Commissioner. Consumer guidance warning that insurers can deny claims if a licensed driver in the home is not listed on the policy.
  3. FAQs About Auto Insurance (Official): North Carolina Department of Insurance. Consumer guidance defining a “family member” as a blood, marriage, or adoption relation residing in the household, and stating those family members should be listed as drivers on the policy.
  4. OGC Opinion No. 08-02-02, Permissible Drivers Under Personal Automobile Insurance Policy (Official): New York State Department of Financial Services. General counsel opinion confirming permissive-use liability coverage under 11 NYCRR § 60-1.1 (Regulation 35-A) and stating that an insurer may charge additional premium, including retroactively, for an unlisted licensed household driver.
  5. OGC Opinion No. 03-04-20, Restricted Driver Endorsement on Automobile Insurance Policy (Official): New York State Department of Financial Services. General counsel opinion addressing whether a policy subject to N.Y. Ins. Law § 3425 may exclude collision coverage for a particular driver, and the signed-acknowledgment condition the Department has required.
  6. OGC Opinion No. 03-09-17, Named Driver Exclusion in Commercial Auto Liability Policy (Official): New York State Department of Financial Services. General counsel opinion holding that an endorsement relieving the insurer of liability while a specifically named person drives violates 11 NYCRR § 60-1.1 (Regulation 35-A).
  7. Commissioner’s Bulletin # B-0010-19, Named Driver Policies (Official): Texas Department of Insurance. Bulletin implementing House Bill 259, prohibiting insurers from delivering, issuing for delivery, or renewing named driver policies on or after January 1, 2020.
  8. Proposed 28 TAC § 5.208, Named Driver Policy Disclosure (Official): Texas Department of Insurance. Rule proposal reproducing the Insurance Code § 1952.0545 definition of a named driver policy and distinguishing it from a standard policy that covers household residents while excluding one driver by name.
  9. Adding a Teen Driver to Your Insurance Policy? (Official): Texas Department of Insurance. Consumer tip page on learner’s permit notification and the claim-denial, policy-voiding, and nonrenewal consequences of failing to tell the insurer about a student driver.
  10. Driver Discovery (Vendor primary documentation): LexisNexis Risk Solutions. Product page describing Additional Driver Discovery across all 50 states and D.C., Youthful Driver Discovery for newly licensed people aged 15–25 in select states, the vendor’s statement that the product is not a “consumer report” under the FCRA, and its instruction that “before relying on any data, it should be independently verified.”
  11. RISK:check Point of Sale (Vendor primary documentation): Verisk. Product sheet describing the identity, garaging, household, and vehicle validation categories and citing premium leakage as “at least a $29 billion problem for the personal auto insurance industry.”
  12. Fair Credit Reporting Act, 15 U.S.C. § 1681a (Official): Federal Trade Commission. Statutory text defining a “consumer report” and the credit, insurance, and employment eligibility purposes that trigger the Act.
  13. Risk Factors for Teen Drivers (Official): Centers for Disease Control and Prevention. Federal safety data on the fatal crash rate for drivers aged 16–19 relative to drivers 20 and older, and the elevated per-mile crash rate for 16-year-olds.
  14. Eberly v. LM General Insurance Co., No. 21-2935 (3d Cir. Aug. 1, 2024) (Official, non-precedential): United States Court of Appeals for the Third Circuit. Non-precedential disposition holding that a regular-use exclusion barring underinsured motorist coverage did not violate Pennsylvania’s Motor Vehicle Financial Responsibility Law.
  15. Auto Insurance, Consumer Guide (Official): National Association of Insurance Commissioners. Consumer guide describing the underwriting-versus-rating distinction and the rating factors insurers file with state regulators.