>Plus, delta-speed practically equals speed when a vehicle collides with a relatively stationary object like a pedestrian or a cyclist. If your road/city/trans

>Plus, delta-speed practically equals speed when a vehicle collides with a relatively stationary object like a pedestrian or a cyclist. If your road/city/transportation system is _routinely_ creating high delta-speed (and delta-mass) interactions then it is poorly designed. As I said elsewhere I have nothing against bikes, but I do have a bone to pick with people who suggest cars/bikes/pedestrians belong on the same grid such that they routinely interface with one another.