4 ms·
40mph is actually right at the inflection point where survivability changes dramatically. At 40mph it's about a 50/50 chance of a car crash with a pedestrian ca
by InclinedPlane 9y ago
40mph is actually right at the inflection point where survivability changes dramatically. At 40mph it's about a 50/50 chance of a car crash with a pedestrian causing a fatality. At 35mph the chances of a fatality go down to 1 in 3, at 30mph it goes down to 1 in 5. At a little under 20mph it's 1 in 10.
- dmix 9y agoOkay, I've heard that 40mph plenty of times here when AI cars come up, so is it possible the car could have slowed down 10mph? I only suggested 10km/hr as an ideal maximum (aka 35mph) given better technology, not as a baseline for today... I've also read that the last speed sign was 45mph before this accident. I used 40mph as it was between the 35mph sign that was coming up before the hit and the 45mph one before it.
- InclinedPlane 9y agoBraking time is about 4 seconds from 40 mph (average braking acceleration is a bit under half a gee for ordinary cars), which means every second of braking is a roughly 10 mph reduction in speed.
- deleted 9y ago[deleted]
- gowld 9y agoPer your own data, 30mph is the "inflection point". 30mph to 40mph cuts survivability by 40%.