Ask any claims adjuster which crash they hate most and you'll usually get the same answer: the unprotected left turn. Two drivers, two stories, no independent witnesses, and a police report that says "fault undetermined" more often than you'd expect. The Insurance Institute for Highway Safety has estimated that about 20 percent of all intersection crashes involve a vehicle turning left across oncoming traffic, and those are the ones where liability flips fastest.
A dash cam doesn't magically prove who was right. But it does capture the three things that decide these cases: the traffic signal state, the distance between the cars at the moment the turn began, and whether the turning driver actually had a turn arrow. That's the difference between "your word against mine" and a $2,000 deductible you don't have to eat.
Here's a real pattern. Driver A is in the left-turn lane, waiting. The light goes from green to yellow to red. The oncoming driver, Driver B, is still 200 feet back and slowing. A decides to clear the intersection and turns. B accelerates to beat the light and hits A's passenger door. At the scene, A says "I had a green arrow." B says "you ran the red." Without footage, the adjuster leans on the police report, which leans on whoever called 911 first.
With footage from A's windshield, the sequence is fixed in time: the yellow light appears at the 2-second mark, the turn starts at 3.1 seconds, B's approach is visible at 4 seconds, impact at 6.8. If the frame shows a solid green for oncoming traffic when A turned, A's claim of a turn arrow collapses immediately. If it shows a red arrow that had already gone to green-on-green before B entered, A's case gets much stronger.
Not all dash cam footage is equally useful in a left-turn dispute. If you're choosing a camera or mounting one, optimize for these:
RedTiger's dual-channel models capture front and rear simultaneously, which matters here: your rear camera records the moment of impact from the opposite angle, and the two files together lock in gaps you can't see from the front alone. The front-and-rear kit is the configuration most left-turn cases want.
I've spoken with enough people who have been through this to notice a pattern in what moves a claim. Adjusters want:
| Evidence | Why it decides the case | Weight |
|---|---|---|
| Signal state on video | Establishes right-of-way without argument | Highest |
| Impact speed indication | Splits liability when both drivers share fault | High |
| Position on the road at impact | Proves whether you were already in the intersection | High |
| Audio reaction | Confirms surprise and sequence | Medium |
| Rear-camera angle | Corroborates the front file | Medium |
Notice what's not on that list: a recorded speed number. GPS stamps are useful for reconstruction, but an adjuster is more persuaded by what the camera saw than by a GPS reading that can be argued as inaccurate.
Fault for left turns varies more by state than most drivers realize. In a handful of states, the turning vehicle is presumed at fault unless there's clear evidence otherwise — the dash cam is your only path out of that presumption. In modified-comparative-fault states, even 20 percent of the blame can reduce your payout by 20 percent, which on a $12,000 vehicle is real money.
A few practical points that don't get covered often enough:
Mounting for intersection cases is a little different from mounting for scenery. Put the lens so that both the road ahead and the overhead signal are in frame, keep the camera level, and set the field of view on the wide side if your model allows a choice. Then test it: drive to a quiet intersection at off-peak hours, make a turn, and review the clip. If the signal isn't visible, move the camera before you forget about it. That ten-minute test is the difference between evidence and a video of your dashboard.
Most drivers install a dash cam after their first dispute. The ones who get real value out of it are the ones who do a five-minute monthly check: confirm the card is healthy, confirm the timestamp matches the clock on their phone, and confirm the rear camera is still recording. A camera that's been silently failing for two months is worse than no camera at all, because you'll assume you're covered when you're not.
Left turns will always be contested. The only way to shorten the argument is to arrive at it with footage that doesn't leave room for two versions of the story.
← Back to Blog