Which of the following is NOT an advantage of expressways?

Pedestrians are not allowed on expressways, which is a significant design feature intended to enhance safety and traffic flow. Expressways are specifically constructed for high-speed vehicular traffic, providing lanes that reduce the risk of accidents involving slower-moving or non-motorized forms of transportation, such as pedestrians.

The design of expressways includes features that contribute to their safety and efficiency, such as wide shoulders to offer emergency stopping space and provide room for vehicles to pull over. Additionally, the presence of a median or barrier between opposing lanes serves to minimize head-on collisions by separating traffic moving in opposite directions. Furthermore, expressways are designed to eliminate cross traffic, meaning that interactions between vehicles on the expressway and those on intersecting roads are avoided, further enhancing safety for all users.

Therefore, the allowance of pedestrians on expressways would compromise these safety measures, making it inappropriate and impractical, highlighting why this option does not represent an advantage of expressways.