This is a vague question so a vague answer you shall receive. A car moving at a constant speed should produce less pollutants then a similar vehicle in stop and go traffic.
Mainly from the exhaust gasses created by the combustion of hydrocarbon-based fuels.
what sort, heavy vehicles, no its a compound
It can defeat armored vehicles...
children
You probably mean what is called a fuel cell. This type of unit is being developed for vehicles, it is used in space vehicles especially
Because even idling engines use fuel.
Time, distance
NO !
The costs for shipping vehicles is constantly variable to fuel costs and distance. A vehicle such as two door sports coupe of 3500 pounds would approximately cost 1500$ as of October 2014.
longer
1000 ft
Maintain a safe distance between vehicles. Never tailgate.
Center lane.
Center line
use more following distance
60 meters or 200 feet
It concentrates the light so it penetrate the farthest distance.