Spend enough time behind a truck on US-64 or a gravel county road and you’ll eventually hear it: the sharp crack of a rock hitting your windshield. Sometimes it leaves a chip the size of a pencil eraser. Sometimes it leaves a line that grows a little every time the temperature swings. Either way, the question is the same: can this be repaired, or does the glass have to be replaced?
Here’s how we think about it at Legacy Collision Center, plus one thing many drivers don’t know about windshields on newer vehicles: the camera behind the glass.
When a chip can usually be repaired
Chip repair injects a clear resin into the damaged spot, cures it and polishes it flush. Done early, it stops the damage from spreading and keeps the original factory seal around your windshield intact. A chip is generally a good candidate when:
- It’s small, roughly the size of a quarter or smaller
- It hasn’t started to run into a crack
- It isn’t right at the edge of the glass, where stress is highest
- It isn’t directly in the driver’s line of sight, where even a good repair can leave a slight distortion
The sooner it’s repaired, the better. Dirt and moisture work into an open chip, and daily heating and cooling put stress on it. That’s how a small chip turns into a crack running across the windshield.
When the windshield needs to be replaced
Replacement is the right call when:
- A crack is longer than a few inches or is still spreading
- The damage reaches the edge of the glass
- The damage sits in the driver’s direct field of view
- There are several chips or cracks close together
- The glass was damaged in a collision along with the frame or pillars around it
The windshield isn’t just a window. It’s part of the vehicle’s structure. It helps keep the roof from collapsing in a rollover and gives the passenger airbag something to push against when it deploys. That’s why auto glass replacement has to be installed with the right adhesive and given the right cure time, not just set in place.
Commercial drivers have an extra reason to pay attention: federal rules in 49 CFR 393.60 limit how much damage a commercial motor vehicle’s windshield can have in the area swept by the wipers.
The part most people miss: the camera behind the glass
If your vehicle has automatic emergency braking, lane departure warning, lane keeping or adaptive cruise control, there’s a good chance a forward-facing camera is mounted behind the windshield near the rearview mirror. That camera reads the road through the glass.
When the windshield is replaced, that camera has to be recalibrated so it’s looking exactly where the system expects. A camera that’s off by even a small angle can misjudge where the lane lines are or how far away the vehicle ahead is. AAA’s research on the cost of repairing driver assistance systems found that transferring and calibrating a windshield-mounted camera added about $360 to a windshield replacement (AAA ADAS repair fact sheet, December 2023). AAA’s broader findings, summarized by Repairer Driven News, showed that these systems can push the total cost of a minor repair up significantly.
The takeaway: if your vehicle has these features, ask any glass or collision shop how they handle camera calibration after a windshield replacement. Skipping it may save money today and leave you with a safety system you can’t trust.
What to do right after a rock hits
- Note where the chip is and take a photo of it with a coin next to it for scale.
- Cover it with a piece of clear tape to keep dirt and water out until it can be looked at.
- Avoid blasting the defroster or air conditioning straight at the glass, and don’t aim a pressure washer at the chip.
- Check your insurance. Many comprehensive policies cover glass damage, and some cover chip repair with little or no out-of-pocket cost.
- Get it looked at quickly. Repair is only an option while the chip is still small.
You can send that photo with a free estimate request, and we’ll give you an honest first opinion on what the glass needs.
Frequently asked questions
How big can a windshield chip be and still be repaired?
As a general rule, chips about the size of a quarter or smaller that haven’t started to crack can usually be repaired. Location matters too: damage at the edge of the glass or in the driver’s direct line of sight usually means replacement.
Will a repaired chip disappear completely?
Usually not completely. A good repair stops the spread and makes the chip much less noticeable, but a faint mark often remains.
Does my car need calibration after a windshield replacement?
If it has a forward-facing camera for features like automatic emergency braking, lane departure warning or adaptive cruise control, the camera needs to be recalibrated after the windshield is replaced so those systems work as designed.
Does insurance cover windshield replacement?
Glass damage is often covered under comprehensive coverage, subject to your deductible and policy terms. Check your policy or call your insurer to confirm.
Can Legacy Collision Center replace my windshield?
Yes. We replace windshields and other auto glass at our shop at 3900 Monroe Road in Farmington. Request a free estimate with a photo or call (505) 419-8248.
Written by the team at Legacy Collision Center, 3900 Monroe Road, Farmington, NM 87401. Questions about your vehicle? Call (505) 419-8248 or request a free estimate.
