Why do multi-lane roadways typically have higher speed limits?

The presence of multiple lanes and the absence of intersections on multi-lane roadways are key factors that contribute to higher speed limits. Multi-lane roadways are designed to facilitate the smooth flow of traffic, reducing the frequency of stops and the potential for conflict created by intersections. This design allows vehicles to travel at greater speeds while maintaining safety, as drivers have more space to maneuver and overtaking becomes easier. The wider road configuration also helps accommodate a higher volume of traffic, which can further justify the increased speed limits since vehicles can maintain an efficient flow without as many delays or interruptions.

In contrast, other factors such as traffic density and vehicle size are less influential on speed limits than the road design itself, which inherently supports higher speeds due to its construction and traffic management features.