It causes the vehicle to arrive at its destination in less time.
Gravity. (Or the shape of space - which is molded by gravity.)
mass
Intertia
Rapid growth in the speed of traveling. A boom in business across the country
Lacerbation
Polar
It's called a longitudinal wave.
Primary waves
A car traveling over 45 mph can hydroplane with about 1/10th of an inch of water on the road.
If you're referring to a jolting sensation while traveling in the car, it's probably kangaroo petrol.
Sound energy causes the particles in the medium it is traveling through to vibrate. The medium is a solid, liquid or gas.