What are the effects of driving at high speed in motor vehicles with combustion engines?

Driving at high speed in vehicles with combustion engines leads to certain effects. Firstly, fuel consumption increases because the engine works harder to maintain higher speeds, which means more fuel is burned. Secondly, the emission of harmful substances rises because burning more fuel produces higher levels of pollutants, such as carbon monoxide and nitrogen oxides. The noise level, however, does not decrease; in fact, it often increases with speed due to engine and wind noise. Understanding these effects helps drivers appreciate the environmental and economic impact of driving fast.