Wheel speed sensors are devices used in vehicles to measure the rotational speed of each wheel. They play a crucial role in systems like anti-lock braking systems (ABS) and traction control, helping to enhance vehicle safety and performance. By monitoring wheel speed, these sensors can detect when a wheel is slipping or locking up. The sensors typically work by generating a signal based on the wheel's rotation. This information is sent to the vehicle's onboard computer, which processes the data to make real-time adjustments to braking and acceleration. Accurate readings from wheel speed sensors are essential for optimal vehicle handling and stability.