Which of the following defines ‘controlled access highway’?

The definition of a 'controlled access highway' is characterized by its design that allows vehicles to enter and exit only at designated points, specifically on-ramps and off-ramps. This configuration is crucial for maintaining high speeds and safety, as it minimizes interactions with local traffic, thus reducing the potential for accidents and traffic congestion. Controlled access highways are often part of broader interstate systems where the aim is to facilitate efficient long-distance travel without the interruptions commonly found on regular public roads.

In contrast, other options do not accurately describe this type of highway. A highway with unrestricted entry describes a typical road where vehicles can enter and leave at any point without control, which is contrary to the concept of controlled access. A road limited to local traffic suggests a more restrictive network that is not designed for high-speed travel, while a path not suitable for heavy vehicles discusses weight restrictions rather than access control. Therefore, identifying the correct option as one that incorporates the structured entry and exit points characteristic of controlled access highways is essential for understanding traffic management and roadway design.