That's very unlikely. More than half of roadway fatalities in the USA involve drugs or alcohol. You'd have much better luck putting a brethalyzer ignition interlock on all vehicles.
One minute of thinking should make it obvious how easily that would be defeated as well.
Also, I'm particularly interested in the effects on pedestrian and cyclist deaths, and it should be large. The relationship between speed and severe injury is nonlinear.
Results show that the average risk of severe injury for a pedestrian struck by a vehicle reaches 10% at an impact speed of 16 mph, 25% at 23 mph, 50% at 31 mph, 75% at 39 mph, and 90% at 46 mph
Yes but "vehicle was speeding" is often _not_ the mode in which pedestrians are killed. Pedestrians walk on the shoulders of poorly lit roadways where the speed limits are greater than 35. This is a recipe for disaster and it is a very common mode for pedestrian deaths, up to 30% on some years, the drivers did nothing wrong in these cases.
The other is bad roadway design. I searched FARS once for all accidents where the pedestrian was killed _after_ a vehicle had become airborne in one way or another (e.g. Left The Roadway).
There were more than 100 when I ran the search, one memorable one was, a vehicle was driving on a roadway in winter which had a descending hill next to it, the vehicle hit the brakes to avoid an accident, lost control, went down the hill, rolling several times, and in the process killed a pedestrian and his poor dog, before finally tumbling into the lower road and landing upside down on another vehicle.
So. Pedestrians have zero safety margin out there. Even maximum enforcement of speed limits will have almost no impact on this. Unless you also want to make 10mph the maximum speed limit inside a city.
I just shared a source illustrating how lower speeds dramatically affect outcomes for pedestrians (never mind that braking distance is way shorter for lower speeds) and you respond with a straw man about rural road shoulders?
Incidentally I tend to favor 30kph for urban cores, which is 18mph, so you’re not far off. Amsterdam recently made this change and it’s nice, but enforcement is so-so. I’m glad to see this come online in addition to enforcement. My six year old who bikes to school is too.
That's very unlikely. More than half of roadway fatalities in the USA involve drugs or alcohol. You'd have much better luck putting a brethalyzer ignition interlock on all vehicles.
One minute of thinking should make it obvious how easily that would be defeated as well.