Which of the following is NOT a safety feature in the tunnel?

Speed bumps are not considered a safety feature specific to tunnels in the same way that the other options are. The primary purpose of speed bumps is to control the speed of vehicles, primarily in parking lots or on roads, and they are generally installed to encourage safe driving behavior rather than to enhance safety during emergencies within a tunnel environment.

In contrast, emergency lighting is essential in tunnels to provide visibility in case of low visibility situations, such as during an emergency evacuation. Pull stations serve as a means to alert authorities or activate fire alarms in case of smoke or fire. Fire phone cabinets provide a crucial communication link in emergencies, allowing individuals to report incidents or request assistance. Each of these features is designed to enhance safety and facilitate emergency response, making them indispensable in a tunnel situation.