Which of the following is a condition that operators of vehicles in a funeral procession must comply with?

The condition that operators of vehicles in a funeral procession must comply with is that they must yield to emergency vehicles with signals. This rule is essential for maintaining safety on the roads, as emergency vehicles are often responding to situations that require immediate attention and their ability to navigate through traffic efficiently can affect public safety.

Funeral processions are generally granted special considerations, such as the ability to move through intersections without stopping under certain circumstances, but this does not exempt them from the responsibility of yielding to emergency vehicles. When an emergency vehicle approaches with lights and sirens, all drivers, including those in a funeral procession, must allow that vehicle to pass. This ensures that emergency services can reach their destinations quickly, whether that be fighting fires, assisting in medical emergencies, or other critical tasks.

The other options, while they may have merit in various traffic scenarios, do not specifically relate to the unique circumstances of a funeral procession and the precedence that emergency vehicles hold in traffic law.