What does FSD do in fog?
The rarest filmed condition in the archive, and the one where the camera-only argument gets tested hardest.
Coverage by software era
How much footage exists for this scenario in each build. Eras with fewer than 3 matching videos are marked — they are anecdotes, not evidence of a trend.
| Version | Moments | Failures | Highlights | Videos | |
|---|---|---|---|---|---|
| v9 | 1 | 1 | – | 1 / 11 | thin sample |
| v10 | 30 | 6 | 24 | 6 / 55 | |
| v10.69 | 17 | 5 | 12 | 1 / 38 | thin sample |
| v11.3 | 1 | – | 1 | 1 / 15 | thin sample |
| v12.4 | 1 | – | 1 | 1 / 7 | thin sample |
| v13.2 | 1 | – | 1 | 1 / 27 | thin sample |
| v14.3 | 1 | – | 1 | 1 / 22 | thin sample |
Watch it happen
Worst first, newest builds first within each severity. Every card opens YouTube at the moment.
At a signal the car behaved poorly and went through when it should not have; driver called it a clear beta mistake, reported it, and did not intervene because skirting that light is common there.
Chris pulls over to wipe snow off the front radar; FSD and Traffic-Aware Cruise Control could not be enabled due to front radar reduced visibility on his older non-heated Model 3 radar.
At a painted-line intersection with traffic from the left at ~55–68 mph, the car took a close gap; driver called it really good but a bit lucky/close versus beta's usual caution.
About to turn when a car suddenly appears out of the fog at the last second, which he describes as pretty scary.
Driver washed the dirty windshield mid-drive for visibility/recording, noting the car only auto-washes when stopped at a red light; he debates counting it as an intervention.
Driver forced the car out of the left lane after it stayed there too long despite Exit Passing Lane being set to yes and at least one car wanting to pass.
Driver set speed to 75 vs 70 limit for traffic flow and said others may count it as an intervention but he does not because the car was not wrong.
Creeping at a left with poor visibility and fencing, the car would not go with someone behind; Chris tapped the accelerator and called it another intervention.
At a stop with very poor sight lines, the car crept and stopped without progressing, so he pressed the accelerator through.
After complimenting the car, it tries to go the wrong way into a school parking area on a Sunday; driver stops it with “Don’t go that way.”
When the path is clear on a blinking yellow the car will not go, so the driver taps the accelerator; it continues once it sees green.
At a stop sign with faded lines the car will not creep far enough for visibility, so the driver taps the accelerator; it still cannot complete the maneuver properly.
At a right turn the car cannot see left/right through trees, prompts to use accelerator or gear stalk, and the driver must tell it to continue.
At a difficult unprotected left with ~60 mph cross traffic and poor visibility, he hits the accelerator to take a gap because the car was too hesitant.
He cancels a lane-change attempt because it is not a challenge and he would not normally make that move with nearby cars.
FSD moved over very early for a pulled-over vehicle as rain reduced visibility; Chris said it felt really good.
After about 13 minutes, visualization shows hazy repeater cameras and a message that FSD may be degraded due to one or more side cameras occluded.
Took a very hard unprotected left with poor visibility and heavy cross traffic at the first real opportunity without intervention.
FSD completes a hard-to-see left turn that previously often needed help, though Chris would have accelerated more aggressively into 50–60+ mph traffic.
Driver summarized an impressive fog commute with only one forced lane change and one windshield clean, calling it almost Autopilot-complete for this route.
Stop-and-go is usually handled well, but on a bend with reduced visibility the car may brake late after not seeing a stopped car ahead.
He allows Autopilot to change lanes and reports no problem.
Notes say it cannot handle railroad crossings, keep-out zones, toll booths, crosswalks, yield signs, temporary construction lights/signs, and may fail in poor visibility, hills, sharp curves, or blocked signs.