Typically, motorists will only replace a headlight bulb that has burned out or is failing. However, replacing just one failed bulb can result in an unbalanced or unpredictable headlight beam, which presents a potential safety risk. From the driver’s perspective, the road ahead will not be properly lit, and the driver will not get the full benefit of the vehicle’s headlights as the car maker originally intended.
From the oncoming driver’s perspective, an uneven headlamp beam can create an equally risky safety issue. The oncoming car will be harder to see and difficult to position on the road. It could also be confused with a single headlight vehicle such as a motorcycle.
Replacing important auto parts in pairs is a common sense idea. Professional automotive technicians and driving safety advocates alike consistently recommend that tires, brakes, shocks, and wiper blades should be replaced in pairs to make sure the vehicle is properly balanced and functioning [...]