What is a key function of guard rails on highways?

Guard rails serve a crucial safety function on highways by preventing vehicles from going off the road. They are specifically designed to absorb the impact of a vehicle that might veer towards perilous areas, such as steep embankments, ditches, or other hazardous obstacles. By effectively redirecting the vehicle back onto the roadway, guard rails help to minimize the likelihood of severe accidents that could occur if a vehicle were to leave the road entirely.

This protective feature is vital for maintaining driver and passenger safety, particularly in high-speed environments where the risk of serious injury is heightened. Unlike options that mention guiding drivers to bus stops, decreasing traffic congestion, or providing parking space, the primary purpose of guard rails is centered on accident prevention and enhancing roadway safety.