Under what condition can apparatus be driven against the normal flow of traffic on limited-access highways?

Driving fire apparatus against the normal flow of traffic on limited-access highways is a critical action that can only be justified under specific circumstances. The correct condition is when the driver has received an all-clear signal. This ensures that the area ahead is safe for the apparatus to proceed without encountering oncoming vehicles, thereby minimizing the risk of accidents.

Receiving an all-clear signal indicates that traffic control measures have been put in place, ensuring the safety of both the fire apparatus and surrounding motorists. This is paramount in maintaining operational effectiveness and ensuring the safety of responders and civilians alike, allowing for swift intervention during emergencies.

While lighter traffic, daylight hours, and emergency situations might influence decision-making, they do not adequately guarantee the necessary safety protocols to allow for such maneuvers. Only an all-clear signal provides the assurance needed to safely navigate against traffic.