What must you not do when an emergency vehicle approaches?

When an emergency vehicle approaches, it is crucial to maintain safety and adhere to traffic laws designed to facilitate the emergency response. Not crossing any signals when an emergency vehicle approaches is important because doing so could impede the vehicle's progress and potentially lead to dangerous situations for both the emergency responders and other road users.

When emergency vehicles like ambulances, fire trucks, or police cars are responding to an urgent situation, they often have the right of way. This means that drivers should stop or yield, ensuring clear passage. If you were to cross signals, it could create unpredictable scenarios, causing crashes or obstructing emergency efforts.

In contrast, the other options touch on various actions that are not necessarily strict prohibitions but require careful consideration. For instance, passing an emergency vehicle should be done with caution and typically only when safe, as it can create additional hazards. Utilizing emergency lanes might be permissible in some situations but generally should be approached with caution. Finally, honking at emergency vehicles can be distracting or disruptive, which is not advisable. Therefore, avoiding crossing signals is a fundamental rule to ensure everyone’s safety during these critical scenarios.