Fig.1. Example of signs indicating the location of an emergency exit (Les Monts, France)
It is usually obligatory to install distance markers to the emergency exits for pedestrians. Standardised panels should be used for this purpose. They are installed in pairs, parallel to the road direction, at intervals of about twenty meters (see Fig 2).
Fig. 2. Example of signs indicating the distance to the nearest emergency exit (Condamine Tunnel, France)