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

When driving a motor vehicle with a combustion engine at high speed, both fuel consumption and the emission of harmful substances increase. This is because the engine needs to work harder at higher speeds, using more fuel and producing more exhaust gases such as CO₂ and nitrogen oxides. The noise level does not decrease at higher speeds; in fact, it typically gets louder due to engine and wind noise. Your selection was correct—remember, driving faster always means more fuel use and more pollution.