The windshield is the most strictly regulated piece of glass on your car. Federal safety standards require a 70% minimum VLT, and state laws generally prohibit any aftermarket tint on the windshield below a specific reference line — usually the AS-1 line or a fixed measurement in inches.
This guide breaks down what the AS-1 line is, why it exists, the three ways state laws reference it, and when clear ceramic windshield films are actually legal.
What is the AS-1 line?
The AS-1 line is a short etched or printed mark on the top portion of a windshield, usually near the center top edge. It is part of the ANSI/SAE Z26.1 safety-glazing standard that classifies automotive glass.
Glass above the AS-1 line is certified for any position on a motor vehicle, including areas where the driver does not need direct sightlines. Below the AS-1 line the glass must meet the stricter "AS-1" clarity requirements used for a driver’s primary view.
The AS-1 line sits roughly 5–6 inches down from the top of a typical windshield, but the exact location varies by vehicle and by glass manufacturer. There is no single universal measurement.
The three state approaches to windshield tint
Approach 1 — AS-1 line reference
Most states reference the AS-1 line directly: non-reflective tint is allowed above the AS-1 line, and any aftermarket film below it is prohibited. States in this group include Florida, Georgia, Ohio, Virginia, and many others.
Approach 2 — fixed-inches rule
Some states ignore the AS-1 line and instead write a fixed-inches rule. Typical examples:
- California — non-reflective tint in the top 4 inches.
- Texas — non-reflective tint in the top 5 inches or above the AS-1 line, whichever is lower.
- New York — non-reflective tint in the top 6 inches.
- Arizona — non-reflective tint above the AS-1 line, or a specific top-strip if AS-1 is missing.
Approach 3 — no windshield tint at all
A small number of states prohibit any aftermarket tint on the windshield, including a top strip. The strictest is New Hampshire, which historically allowed no aftermarket windshield tint under RSA 265:95-b. Always check your current state page.
What "non-reflective" means on a windshield
States that allow a windshield top strip usually require it to be non-reflective. A non-reflective film has a low external reflectance (often under 10%) and does not produce the "mirror" look at night.
Metallic top-strip films sold in the 1990s often fail modern state non-reflective requirements. Modern ceramic top strips comfortably meet the requirement; see our film technology guide.
Can I tint the entire windshield with a clear ceramic film?
Generally no. Even near-clear films at 90% VLT are considered aftermarket tint below the AS-1 line in most states and will technically violate the statute. A handful of states, notably Oklahoma (with specific labeling requirements) and a few others, permit specialty clear windshield films under narrow circumstances.
If you want UV/heat rejection across the whole windshield, ask your state DMV or state police inspection unit in writing before installing. Keep the written response in your vehicle along with the film’s certification paperwork.
Windshield tint: safety engineering, court cases, and modern products
Why the windshield rule exists: visibility + airbag interaction
Windshields are not just windows; they are structural safety elements. In a frontal collision, the windshield prevents front-seat occupants from being ejected and provides the reaction surface for the passenger airbag to deploy off. Under FMVSS 212, the windshield must remain in its frame during a 30 mph crash test.
Aftermarket film can compromise both functions. A film with poor adhesive can separate in a crash, breaking the windshield’s structural bond with the urethane frame seal. Darker tint also reduces low-light visibility, increasing the risk of pedestrian and cyclist non-detection at dusk. The 70% minimum exists because photometric studies show contrast sensitivity drops measurably below 70% VLT.
These are the reasons the FMVSS 205 70% windshield floor is federally preemptive. States cannot authorise darker windshield tint, only allow a top-strip above the driver’s direct sightline.
How state statutes reference the AS-1 line
State statutes take one of three approaches to describing where windshield tint can start:
| Approach | Example states | Practical meaning |
|---|---|---|
| Reference AS-1 line directly | Florida, Georgia, Ohio, Virginia, Illinois, North Carolina | Tint legal only above the factory AS-1 mark |
| Fixed inches from top | California (4"), Texas (5"), New York (6"), Arizona (factory AS-1 or top) | Measure from the top edge; no need to find AS-1 |
| Explicit prohibition | New Hampshire (historically), Vermont (historically) | No aftermarket windshield film at all |
Clear UV/IR windshield films: the grey-area product
Premium films like 3M Crystalline CR90, XPEL XR Plus 80, and LLumar AIR 80 are sold as full-windshield films. At 80–90% VLT, they meet or exceed the FMVSS 205 70% minimum on their own. But state statutes usually prohibit any aftermarket film below the AS-1 line, regardless of VLT.
A handful of states have administrative guidance that explicitly permits 70%+ clear films across the entire windshield if a manufacturer certification sticker is affixed. Oklahoma, for example, allows it with a certification sticker under DPS guidance. Most other states are silent, which in traffic court means “prohibited unless explicitly allowed.”
Before committing $800+ to a clear windshield film, request a written ruling from your state DMV or state police inspection unit. Keep the response in the vehicle. If an officer writes a ticket, the written ruling is the most effective dismissal evidence available.
The non-reflective requirement and why metallic top strips fail
Most state windshield rules include a non-reflective clause: the top-strip film cannot mirror-reflect exterior light into oncoming traffic. Statutes define the threshold using one of two metrics:
- External reflectance % — commonly capped at 20% or less (California, Arizona, New Jersey).
- Flat “non-reflective” language — enforced by officer judgment in court (Ohio, Virginia, Georgia).
Why older metallic films fail modern rules
Metallic sputtered films from the 1990s and early 2000s typically reflect 25–45% externally. They will fail the non-reflective test in strict states and can fail officer judgment in ambiguous-language states. Modern ceramic top strips reflect 5–10% externally and pass both tests.
If you purchased a vehicle with an older metallic top-strip already installed, a compliance inspector will almost always flag it. Replacement with a modern ceramic strip is typically a $100–$200 job and eliminates the reflectivity risk entirely.
Quick lookup for every U.S. state
Use the table below to jump straight to any state’s tint law page. Front side VLT is the most-cited number and is shown for sedans. Deep-link into any state for the full rule, SUV differences, windshield rule, medical exemption, and the statute citation.
| State | Front side VLT | Back side VLT | Rear VLT | Medical |
|---|---|---|---|---|
| Alabama | 32% VLT or higher | 32% VLT or higher | 32% VLT or higher | Yes |
| Alaska | 70% VLT or higher | 40% VLT or higher | 40% VLT or higher | Yes |
| Arizona | 33% VLT or higher | Any VLT allowed | Any VLT allowed | Yes |
| Arkansas | 25% VLT or higher | 25% VLT or higher | 10% VLT or higher | Yes |
| California | 70% VLT or higher | Any VLT allowed | Any VLT allowed | Yes |
| Colorado | 27% VLT or higher | 27% VLT or higher | 27% VLT or higher | Yes |
| Connecticut | 35% VLT or higher | 35% VLT or higher | Any VLT allowed | Yes |
| Delaware | 70% VLT or higher | 70% VLT or higher | 70% VLT or higher | Yes |
| Florida | 28% VLT or higher | 15% VLT or higher | 15% VLT or higher | Yes |
| Georgia | 32% VLT or higher | 32% VLT or higher | 32% VLT or higher | Yes |
| Hawaii | 35% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Idaho | 35% VLT or higher | 20% VLT or higher | 35% VLT or higher | Yes |
| Illinois | 35% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Indiana | 30% VLT or higher | 30% VLT or higher | 30% VLT or higher | Yes |
| Iowa | 70% VLT or higher | Any VLT allowed | Any VLT allowed | Yes |
| Kansas | 35% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Kentucky | 35% VLT or higher | 18% VLT or higher | 18% VLT or higher | Yes |
| Louisiana | 40% VLT or higher | 25% VLT or higher | 12% VLT or higher | Yes |
| Maine | 35% VLT or higher | Any VLT allowed | Any VLT allowed | Yes |
| Maryland | 35% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Massachusetts | 35% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Michigan | Any VLT allowed | Any VLT allowed | Any VLT allowed | Yes |
| Minnesota | 50% VLT or higher | 50% VLT or higher | 50% VLT or higher | Yes |
| Mississippi | 28% VLT or higher | 28% VLT or higher | 28% VLT or higher | Yes |
| Missouri | 35% VLT or higher | Any VLT allowed | Any VLT allowed | Yes |
| Montana | 24% VLT or higher | 14% VLT or higher | 14% VLT or higher | Yes |
| Nebraska | 35% VLT or higher | 20% VLT or higher | 20% VLT or higher | Yes |
| Nevada | 35% VLT or higher | Any VLT allowed | Any VLT allowed | Yes |
| New Hampshire | 70% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| New Jersey | Not allowed | Any VLT allowed | Any VLT allowed | Yes |
| New Mexico | 20% VLT or higher | 20% VLT or higher | 20% VLT or higher | Yes |
| New York | 70% VLT or higher | 70% VLT or higher | 70% VLT or higher | Yes |
| North Carolina | 35% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| North Dakota | 50% VLT or higher | Any VLT allowed | Any VLT allowed | Yes |
| Ohio | 50% VLT or higher | Any VLT allowed | Any VLT allowed | Unclear |
| Oklahoma | 25% VLT or higher | 25% VLT or higher | 25% VLT or higher | Yes |
| Oregon | 35% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Pennsylvania | 70% VLT or higher | 70% VLT or higher | 70% VLT or higher | Yes |
| Rhode Island | 70% VLT or higher | 70% VLT or higher | 70% VLT or higher | Yes |
| South Carolina | 27% VLT or higher | 27% VLT or higher | 27% VLT or higher | Yes |
| South Dakota | 35% VLT or higher | 20% VLT or higher | 20% VLT or higher | Yes |
| Tennessee | 35% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Texas | 25% VLT or higher | Any VLT allowed | Any VLT allowed | Yes |
| Utah | 43% VLT or higher | Any VLT allowed | Any VLT allowed | Yes |
| Vermont | Not allowed | Any VLT allowed | Any VLT allowed | Yes |
| Virginia | 50% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Washington | 24% VLT or higher | 24% VLT or higher | 24% VLT or higher | Yes |
| Washington, D.C. | 70% VLT or higher | 50% VLT or higher | 50% VLT or higher | Yes |
| West Virginia | 35% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Wisconsin | 50% VLT or higher | 35% VLT or higher | 35% VLT or higher | Yes |
| Wyoming | 28% VLT or higher | 28% VLT or higher | 28% VLT or higher | Yes |
This snapshot summarises sedan rules only. SUV, van, and pickup (MPV) rules differ in most states — see each state’s dedicated page for the full picture. All values are re-verified against primary sources for 2026 (see sources & methodology).
Windshield tint laws & the AS-1 line — FAQ
Can I tint my whole windshield with clear ceramic film?
In most states, no. A clear ceramic film applied below the AS-1 line or fixed-inches top strip is still aftermarket film and will violate the statute. A small number of states allow it with specific certification; confirm with the state DMV in writing before installing.
How far down is the AS-1 line exactly?
The AS-1 line is etched by the glass manufacturer; there is no single universal measurement. It usually sits 5–6 inches down from the top of the windshield but varies by vehicle.
What if my windshield does not have an AS-1 line?
Most statutes provide a fallback of a fixed measurement (typically 4–6 inches) from the top of the windshield. Check your state page for the exact fallback rule.
Sources & references
How we verified this guide
- Primary sources only. VLT limits, windshield rules, and medical exemption procedures cited in this guide are verified against each state’s statute, administrative code, or DMV publication. See our sources & methodology.
- Annual re-review. Every guide is re-read against current state law at least once a year. This page was last reviewed on January 15, 2026.
- No affiliate influence. Our rankings, recommendations, and ticket-fighting advice are never paid. See our editorial policy.
- Not legal or medical advice. Enforcement is fact-specific; always verify with your local DMV, your state statute, or a licensed attorney before acting. See the legal disclaimer and medical disclaimer.
- Report an error. Spot something wrong or outdated? Contact our editors — we publish corrections quickly and note them in our next review cycle.