What can restrict the functionality of a lane departure warning system?

The lane departure warning system relies on clear road markings to detect lane boundaries and alert the driver if the vehicle unintentionally drifts out of its lane. If the road surface is dirty, these markings can become obscured, making it difficult for the system to function properly. Similarly, if road markings are missing entirely, the system has no reference to detect lane changes. Guardrails do not affect the system's ability because it only uses lane markings for guidance. Understanding this helps you recognize that any factor hindering the visibility of road markings can limit the effectiveness of lane departure warnings.