Which part of the trafficway is specifically designed for emergency use?

The shoulder of the trafficway is specifically designed for emergency use. It serves as a designated area next to the travel lanes where vehicles can pull over safely in the event of a breakdown, medical emergency, or other unexpected situations. This space allows drivers to exit the active roadway while minimizing the risk of collisions with moving traffic, providing a buffer zone that enhances safety.

Unlike the other options, which serve different functions (lanes for regular traffic flow, pavement as the surface for vehicles, and median typically as a divider between opposing traffic), the shoulder is expressly intended to offer a safe haven for vehicles that are not in active transit. This distinction emphasizes the critical role the shoulder plays in maintaining traffic safety and facilitating emergency response situations.