Jack,

The problem with driving cars and then hopping into the bus is the perception of speed.

With cars you sit close to the road and your peripheral vision conveys to your brain the speed of the road surface immediately in front of the car.

The exact opposite of that is a plane at altitude never provides you with a sense of speed despite the fact you are going many times the speed of the car because you are a distance from the surface. The same holds true to an extent with the bus. Your eyes that were 3 feet from the surface are now 2 1/2 times that distance so at 65 MPH you don't get the same visual sensation of speed.

And you are exactly correct that it is the problem stopping that will eventually catch up to the speeders