When must vehicles adhere to the posted speed limit signs?

Answer: B — At all times

Vehicles must adhere to the posted speed limit signs at all times, regardless of the specific conditions such as hour of the day or congestion levels. This consistent enforcement of speed limits is critical for maintaining safety in high-traffic areas, particularly within airport environments where pedestrian traffic, other vehicles, and potential hazards are prevalent. Compliance with these speed limits helps reduce the likelihood of accidents and ensures a safer environment for both drivers and pedestrians. Speed limits are set based on an assessment of various factors including traffic flow, nearby facilities, and safety considerations, making it essential for drivers to observe these limits consistently to promote safety for all individuals in the vicinity.