Earlier quoted context omitted.
I think a big issue with that instance (monorail) is probably because they just threw out years of radar data without having a comparable reliability in place with the vision only. Completely mental that they are allowed to run this on public roadways.
I'm not sure radar would help - the pillar is a stationary object, and car based radar tends to drop all returns at the same rate as the car is moving forward. Radar isn't terribly precise, so you end up with tons of returns off signs, bridge abutments, etc. Remember, with radar, Teslas will happily autopilot themselves into a semi truck across the road, stopped fire trucks, concrete road barriers, etc. I see no reas…
https://news.ycombinator.com/item?id=16722461
Radar does detect stationary objects, come on.