If a driver sees a white diagonal arrow on a lane control signal, what action should they take?

A white diagonal arrow on a lane control signal indicates that the driver should not change lanes in the direction pointed by the arrow. The presence of a white diagonal arrow serves as a caution or warning that changing lanes is not permitted or advisable at that moment, guiding drivers to maintain their current lane. It is important for drivers to adhere to these signals to ensure safety and smooth traffic flow.

While it might initially seem that changing lanes as indicated by the arrow could be appropriate, the key is that the arrow in this context signifies a restriction. Each road sign and signal is designed to communicate specific rules and safety measures to drivers, and understanding these signals is crucial for any vehicle operator, especially in emergency response situations where time and safety are of the essence.