Earlier quoted context omitted.
Waymo uses new cars which probably have 100km/h (62mph) to zero stopping distance around 36m (120ft) — that's what my 2020 car quotes and tests at. As stopping distance grows quadratically, from 50km/h it would have stopped in 8m. Two lane street is usually at least 8m wide. The claim was that after braking for 10m, it was still going at 40km/h. It'd take another 6-7m to come to a full stop. If it was a full 18m stop…
To be honest, I don't know how to convert freedom units to km/h. I based my estimate on the Waymo going slower than other cars and the city speed limit in Toronto being 50 km/h, and I took a stab at the numbers. I think it was Beverly Blvd which the internet says has a speed limit of 35 mph = 56 kph at the time? I was in the back seat so I couldn't judge the distance that well. I passed the other car in a second so I…
Human drivers correct each others' mistakes every single day, and we don't hear about them because... well, nothing has happened. The argument could be made that Waymos will make fewer mistakes, so fewer evasive maneuvers will be needed, but it's great to hear that Waymo's performance is coming closer to bringing good human driver capability with faster reaction time enabled by tech.
I appreciate you converting to SI units, but I am ok with you keeping them as-is too: either side can do the conversion to whatever they need, and HN is very much a mixed audience.