Structural facilities related to operation and safety in tunnels.

Samenvatting

In addition to the basic cross-section and alignment geometry required for traffic operations, special facilities are provided in most road tunnels to cater for the particular operational and safety demands of the tunnel environment.

Emergency exits are provided in all except the shortest tunnels to allow tunnel users to evacuate on foot from the traffic tube to a place of safety.The different types of emergency exits for pedestrians are considered in Section 7.1. These include cross-connections and cross-passages between tubes, refuges where the public can remain safely during an emergency, and safety galleries (passages) constructed alongside the traffic tubes or perhaps under the carriageway and leading to the surface.