Steering wheel lock is a safety feature that prevents a vehicle from being steered, serving as an anti-theft measure and a parking aid. The built-in steering column lock, which engages when the key is removed, and aftermarket physical locks that are clamped onto the steering wheel. The built-in lock is a standard feature on modern cars that works by using a spring-loaded pin to prevent the wheel from turning when the ignition is off, and it can be unintentionally triggered by turning the wheel while exiting or parking.