I’ve been waiting for someone to post about this, but I guess it’s up to me.
Since the last update, my Model S has begun reading speed limit signs using its cameras rather than relying only on Google map data. Google’s speed limit data is usually but not always correct, so I’ve been wanting for a while for the car to read the signs itself.
Now I got what I wanted, and it’s a bit of disaster. The car does a pretty good job of reading signs up to 60 MPH but is blind to anything faster. After days of testing, I have never yet seen it correctly read a sign faster than 60. (In a construction zone it did mis-read one 65 sign as 45 and a couple as 55!) It is completely blind to 70 and 75 MPH speed limit signs.
This leaves Autopilot effectively crippled. It means that every time I leave town — any town — and the speed limit goes from 60 to 70 or 75, Autopilot remains restricted to 65 MPH max. Cruising down the highway on autopilot at 65 MPH while most other drivers are zipping along at 75 or 80 is not really acceptable. We’ve heard a lot about crippled Autopilot in Europe, but now it seems we get crippled Autopilot in the USA.
Workarounds… One trick I’ve found is to pull over and turn off on the first side road (typically a county road) that I encounter, then immediately turn around and get back on the highway. This causes the car to reset its speed limit and revert to Google’s data. This is the only way I’ve found to get Autopilot back up to speed on the highway — until I reach the next town and the next speed zone. I found that this only works if I pull onto a numbered road that the car (or Google, I guess) interprets as having its own speed limit. Just pulling off the side of the road, private drive, roadside park, etc., is not enough to trigger the reset.
Since the last update, my Model S has begun reading speed limit signs using its cameras rather than relying only on Google map data. Google’s speed limit data is usually but not always correct, so I’ve been wanting for a while for the car to read the signs itself.
Now I got what I wanted, and it’s a bit of disaster. The car does a pretty good job of reading signs up to 60 MPH but is blind to anything faster. After days of testing, I have never yet seen it correctly read a sign faster than 60. (In a construction zone it did mis-read one 65 sign as 45 and a couple as 55!) It is completely blind to 70 and 75 MPH speed limit signs.
This leaves Autopilot effectively crippled. It means that every time I leave town — any town — and the speed limit goes from 60 to 70 or 75, Autopilot remains restricted to 65 MPH max. Cruising down the highway on autopilot at 65 MPH while most other drivers are zipping along at 75 or 80 is not really acceptable. We’ve heard a lot about crippled Autopilot in Europe, but now it seems we get crippled Autopilot in the USA.
Workarounds… One trick I’ve found is to pull over and turn off on the first side road (typically a county road) that I encounter, then immediately turn around and get back on the highway. This causes the car to reset its speed limit and revert to Google’s data. This is the only way I’ve found to get Autopilot back up to speed on the highway — until I reach the next town and the next speed zone. I found that this only works if I pull onto a numbered road that the car (or Google, I guess) interprets as having its own speed limit. Just pulling off the side of the road, private drive, roadside park, etc., is not enough to trigger the reset.