Hacker News Reader

> Radar is not active if the speed is higher than a specific threshold; it looks like it is written on the manual.

I'm having trouble understanding why that would be the case. Why anyone wouldn't want the radar active when going down the highway.

It is not as if it doesn't work at highway speed...

View on HN

That's because he is wrong. The radar is active at all speeds. In my experience, the radar basically only identifies cars and car shaped objects.

Radar on the Teslas, if it works like how I am familiar with, just detects "things". Things that have a decent radar return. This class of things does indeed include cars and other vehicles, but should also include walls and such.

It is likely that they're using at least 2-D radar, so the system should be able to discriminate between an object directly in the path of travel, and one that is off to the side.

Sorry for not having quoted the exact paragraph in my very first comment. You can find the reference just above; it stops to work at around 90 mph (150 km/h) - Tesla Model S manual, Collision Avoidance Assist, page 95.

Additional limitations are listed in page 96.

Exactly.

"Automatic Emergency Braking operates only when driving between approximately 7 mph (10 km/h) and 90 mph (150 km/h)." -- Model S Manual (you can find it online)

Reply on news.ycombinator.com