What is the main purpose of a controlled access highway?

The main purpose of a controlled access highway is to limit the number of entry and exit points. This design feature significantly enhances safety and efficiency by reducing the chances of collisions that can occur when vehicles enter or leave the roadway. By having fewer access points, traffic flow is generally smoother, with less disruption from vehicles merging into or out of the traffic stream. This design also allows for higher speed limits, as drivers can travel without frequent interruptions from stops and starts.

In contrast, options like encouraging pedestrians, facilitating local traffic, or allowing frequent stops are characteristics that do not align with the design and purpose of controlled access highways. These highways prioritize the movement of long-distance traffic rather than local or pedestrian access, highlighting their role in improving overall traffic efficiency and safety on major transportation routes.