What is runaway ramp?

A runaway truck ramp, also known as an emergency escape ramp or truck arrester bed, is a safety feature typically found on steep downhill stretches of highway. It is a long, sloping section of roadway that is designed to slow down and stop out-of-control trucks that are unable to stop using their brakes alone. The ramp is typically made of a low-friction material, such as gravel or crushed stone, that allows the wheels of the truck to grip and slow down. The ramp is usually preceded by warning signs and is intended as a last resort for truck drivers who have lost control of their vehicle, so they can safely stop before reaching a more populated area or a dangerous location.