What must drivers do when they are given a warning from a law enforcement vehicle?

When a driver is given a warning from a law enforcement vehicle, the appropriate action is to yield the right-of-way if warned properly. This response is based on the understanding that law enforcement officers are often directing traffic or responding to an emergency situation, and yielding ensures both safety and compliance with the law.

Yielding the right-of-way helps maintain order on the road and allows officers to perform their duties effectively. It is critical for drivers to recognize signals from law enforcement, which often include lights and sirens, as these indicate the need for immediate compliance to promote public safety.

The other options suggest actions that may lead to dangerous situations or demonstrate a lack of respect for law enforcement directives. For instance, ignoring the warning undermines the officers' authority and could lead to traffic incidents. Speeding up can create hazards for both the driver and others on the road, while waiting for a secondary unit to arrive might cause unnecessary delays and may escalate a situation that could have been resolved quickly and safely by yielding to the initial officer's guidance.