What is the usual speed limit on two-lane divided highways?

The usual speed limit on two-lane divided highways is typically set at 55 mph. This speed limit is established to balance the need for efficient travel with safety considerations. Two-lane divided highways are often located in rural areas where there can be varying levels of traffic and potential hazards, such as intersections and pedestrian crossings. Setting the limit at 55 mph helps ensure that drivers have adequate time to react to changing conditions and that the potential for serious accidents is minimized.

In contrast, higher speed limits, such as 65 mph or 75 mph, are more common on multi-lane highways or freeways where higher traffic volumes and better road conditions allow for safer higher-speed travel. A 45 mph limit would generally be too low for these types of highways, limiting the flow of traffic unnecessarily. Therefore, the 55 mph limit is designed to promote both safety and efficiency while driving on two-lane divided highways.