Windshield tint and the AS-1 line: what Texas actually allows on Lubbock glass
Texas allows tint on a windshield only along the top strip. Under Tex. Transp. Code § 547.613, a sunscreening device on the windshield cannot extend below the AS-1 line or more than five inches down from the top, whichever applies to your vehicle. The windshield and film together must transmit 25 percent or more light and reflect 25 percent or less, and the film cannot be red, blue, or amber. The same 25/25 standard applies to the side windows next to the driver.
That location rule is absolute and has nothing to do with how light the film is. A nearly clear film applied across the whole windshield is still outside the statute, because the statute restricts where the film goes, not just how dark it gets.
Finding the AS-1 line on your own glass
On most windshields the AS-1 marking is etched into the glass near the upper corners, part of the small block of manufacturer lettering. Draw a line straight across from that mark and you have the boundary. Film goes above it. Nothing goes below it.
If you cannot locate an AS-1 marking, the five-inch measurement from the top edge is the fallback the statute gives. Measure it on the glass itself, not from the headliner, and measure at the center of the windshield rather than the corners, since the curve at the edges of a modern windshield will mislead you.
This is worth checking before you pay anyone to install anything, and worth checking again after the work is done.
Why South Plains drivers want that strip in the first place
Lubbock sits at roughly 3,200 feet on the Llano Estacado with open ground in every direction and very little to break a low sun. The city's grid runs numbered streets east and west: 19th, 34th, 50th, 82nd. Drive any of them at the right hour and the sun is sitting directly in the top of your windshield. The Marsha Sharp Freeway does the same thing on a bigger scale, and the morning commute in on US-62/82 from Wolfforth puts you nose-first into a sunrise for part of the year.
Then there is what the wind has already done to the glass. Blowing dust is a genuine South Plains hazard, heaviest in March and April when a dryline or a tightening pressure gradient drives strong wind across dry, worked ground. Airborne grit at highway speed does not crack a windshield in one pass. It frosts and pits the surface over years, and a pitted windshield scatters light instead of passing it cleanly. Low sun through pitted glass is much worse than low sun through fresh glass, which is why a lot of drivers here reach for a sun strip as their first fix.
A legal strip helps with the sun sitting high. It does nothing for pitting, and no film will restore glass that has been sandblasted. If the glare is worst when the windshield is dirty or when oncoming headlights smear at night, the problem is the surface of the glass, not the amount of light coming through it.
Replacement day is when a legal strip quietly becomes an illegal one
The film is not part of the glass. When the old windshield comes out of the car, the strip goes to the dumpster with it. Whatever was on there, compliant or not, is gone.
That leaves two ways to get it wrong. The first is assuming the replacement includes the strip. It usually does not unless you ask for it, and a driver who has had a tinted band up top for six years will spend the next week squinting on 82nd Street wondering what changed. The second is having the strip reapplied somewhere other than a shop that measures. New glass means a new AS-1 marking in a slightly different place, and a strip cut to match the old windshield can end up sitting low on the new one.
Texas also puts weight on labeling. Installers face fines up to $1,000 for failing to apply the required compliance label. If a shop applies film to your vehicle and no label appears, that is a straightforward question to ask before you drive off.
The practical move is to sort out the tint when you book the glass, not after. Ask whether the shop applies film itself or refers it out, and ask when the film can go on relative to the new windshield being set. If your replacement is a mobile job in Shallowater or out toward Idalou, the film side of the work may need to happen separately, because a 40 mph day with dust in the air is already a marginal environment for setting glass clean.
The exceptions, including the one that is not a permit
Factory-tinted glass is treated differently from applied film. Some commercial and law enforcement vehicles are exempt. And Texas recognizes a documented medical need.
The medical exception is worth being precise about, because drivers misunderstand it constantly. It is a defense to prosecution, not a permit. Nothing about it stops an officer from writing the citation during a stop on Loop 289. It gives you grounds to defeat the charge afterward with your documentation in hand. If a shop tells you a doctor's note means you cannot be ticketed, that is not what the law says.
Nothing on the calendar will check any of this anymore
House Bill 3297 ended the annual safety inspection for non-commercial vehicles in Texas effective January 1, 2025. Drivers now pay a $7.50 inspection program replacement fee at registration, $16.75 for a new vehicle covering its first two years, according to the Texas Department of Public Safety. Emissions testing survives in a list of named counties around Houston, Dallas-Fort Worth, Austin, El Paso and San Antonio. Lubbock County is not on that list, and neither are Hockley, Terry or Hale.
So for a Lubbock, Levelland, Brownfield or Plainview driver, there is no periodic state check of any kind on a regular passenger vehicle. Nobody will look at your tint on a schedule. The only remaining look is a traffic stop, and § 547.613 is enforced at the officer's judgment when that stop happens.
That same statute is the one that covers obstruction of view generally. Texas has no crack-length rule. What the law prohibits is an object or material on the windshield that obstructs or reduces the driver's clear view. Tint below the AS-1 line and a crack sitting in your sightline both fail the same test for the same reason.
Four questions drivers ask about the strip
Can I run a light film across the whole windshield if it still passes 25 percent? No. The transmission standard and the location rule are separate requirements. Film below the AS-1 line or more than five inches down fails regardless of how light it is.
Does the strip have to match my side windows? The side windows next to the driver face the same 25/25 standard. The windshield adds the location restriction that the side windows do not have.
My truck came from the factory with a shaded band at the top. Is that tint? Factory-tinted glass is treated as an exception under the statute. Applied film is what the rules above govern. If you are unsure which you have, the shop replacing the glass can tell you what the original part carried.
Will my new windshield have the AS-1 mark in the same spot? Not necessarily. Have the strip measured against the new glass rather than transferred by eye from the old dimensions.
If you are scheduling a windshield replacement anywhere from Plainview down to Brownfield and you want the sun strip back on the new glass, say so when you book. Call or send a quote request with your year, make and model, and mention the tint so it gets planned into the same visit instead of becoming a second trip.