A funeral procession may proceed through a red signal if what condition is met?

The correct choice is based on the principle that a funeral procession is often granted certain privileges to allow for the respectful and orderly passage of mourners. When the first vehicle in the procession enters the intersection before the traffic signal changes to red, it signifies that the procession has already started moving through the intersection when it was still legal to do so. This means that the stream of vehicles following should also logically be allowed to continue through the intersection without stopping abruptly, as it maintains the integrity and flow of the mourners' vehicles.

In this context, the right of way is established based on the movement of the first vehicle. Such regulations help ensure that funeral processions can pass without unnecessary interruption, paying respect to the occasion.

The other conditions listed do not explicitly justify the procession proceeding through a red signal according to typical traffic laws. While each situation might involve considerations like police guidance or yielding from other vehicles, the definitive rule here emphasizes the importance of the first vehicle's entry into the intersection prior to the light change. This upholds the sanctity of the procession while ensuring traffic safety.