Under what condition can a vehicle be driven below the minimum speed in the leftmost lane of the Interstate highway?

Driving below the minimum speed in the leftmost lane of an Interstate highway can be permissible during traffic congestion that prevents safe driving. The leftmost lane is typically designated for faster-moving traffic, so vehicles should strive to maintain a certain speed. However, when traffic congestion occurs, it can create a situation where it is unsafe or impractical to adhere to the minimum speed limit.

This context is important because drivers must prioritize safety and compliance with traffic flow. In heavy traffic situations, vehicles may need to slow down to avoid collisions or navigate safely through congested conditions, which is a more practical consideration than adhering strictly to a speed limit. Other conditions, such as inclement weather, night driving, or the type of vehicle being operated, do not universally provide a valid reason for driving below the minimum speed in that lane. In these circumstances, drivers should consider moving to less congested lanes where it may be safer to maintain higher speeds when conditions allow.