3
There are two collisions in a crash. The first collision is when the vehicle strikes the object and the second when the unrestrained occupants strike the interior of the vehicle.
a lot
Many head-on collisions may occur on two lane roads while passing, when there is oncoming traffic.
3million
Each year, there are about 100,000 collisions in the USA alone. Only less than half of these are fatal collisions.
There are 3 collisions that occur when a vehicle hits a solid object; the initial impact, the passenger impact on restraints or parts of the vehicle, passengers suffering internal collisions with organs
One, if you only count the exact second fracture when the crash happens. Multiple, if you count all the collisions directly resulting from a crash. For example from ripped off parts of the vehicle fall on the ground, the person driving hitting the wheel, or the objects inside the car colliding together and falling to ground. One could say "as many collisions in a crash as there are individual moving objects"
50%
business districts where there is often a high volume of traffic.
Misjudge the closure rate of oncoming traffic
Misjudge the closure rate of oncoming traffic