Immediately before the collision, the speed of A is 3 ms-1 and the trucks are moving towards each other.
However, major crashes - such as the high-speed collision in Eschede, Germany, which killed more than 100 - can distort the statistics for individual years.
He said it was his belief that the collision occurred because of speed.
However, CCTV evidence revealed he had been speeding for 11km before the collision, hitting a top speed of 128mph and driving at over 90mph when he hit the retired academic's vehicle, which was properly lit.
The collision had been at a low speed and was with the motorcycle, not the rider.
They must slow down to about 19mph, a speed that, in case of collision, kills less than 5%.
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For instance, if one molecule approaches another, it will drift along at the same speed with no thought of avoiding a collision.
In a more destructive but higher-stakes mode, two kids would run straight at each other at full speed until one (the chicken) turned away to avoid the collision.
But the Woodland Trust warned that conservation groups were potentially on a collision course with the government over the environmental impact on the HS2 high-speed rail route between London and Birmingham.
Officials said the plane suffered more damage than originally thought in the collision, including the propeller damage, and the loss of wing flaps and the air speed indicator.
Sgt Martyn Bougourd, a police collision investigation officer, said he calculated that the quad bike had been travelling at 32mph, within the 35mph speed limit for the road.
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