What does a steady red light instruct the driver to do?

A steady red light signals that the driver must stop and remain stationary. In the context of air transportation, this signal serves a critical safety function, typically indicating that it is unsafe to proceed. This is particularly important when it comes to operations in and around airports, where the movement of ground vehicles must be carefully coordinated with aircraft operations to prevent accidents and ensure the safety of all personnel.

The significance of the steady red light is underscored by the fact that it differentiates this instruction from other signals that may indicate caution or permission to proceed, which would typically be communicated with different light signals. Understanding this rule is essential for anyone involved in air transportation, as compliance with these signals contributes to the overall safety and efficiency of airport operations.