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January 29, 2020

 Road tunnels and technology in an operational perspective
Arild Petter Sovik, Tunntech Global News

Public Address System In bidirectional tunnels

Written by  Nov 03, 2017

It takes time from the emergency services are notified until they arrive at the tunnel. This must also road users know and the road authority have the responsibility that this assumption is known.

Safety equipment are quite important when it comes to tunnels without any possibilities to escape from one tube to another. Maybe in some cases there are 5 to 10 kilometre to the nearest portal. Early notification to the motorists can be crucial for the outcome of a critical incident or fire.

When it comes to understanding the critical situation, there may be a delay before the individual road user understand and can decide what to do to rescue themselves. Road users need information and decision support to ensure that this phase is as short as possible. This can be provided through notification via radio broadcast, public address system and eventually other measures as a result of technological developments.

Public address systems has been used for tunnels in Europe for several years. The systems has mainly been installed in 2 tube tunnels with unidirectional traffic an the messages is easy to perceive. To install these systems in bidirectional tunnels and make sure that the road user can perceive the message is an other challenge. To handle the delay in both directions has been difficult to configure.

The Norwegian Public Roads Administration has decided that long bidirectional tunnels shall be equipped with public address systems, and is now specifying these systems for these tunnels. 

Video: Test of PA system in Vagsbygdporten tunnel in Norway (norwegian annoncement). 


Last modified on Sunday, 03 December 2017 19:54
Arild Petter Sovik

Editor, Tunntech Global News

E-mail:  arild.sovik@tunntech.no
Phone:  +47 950 88 793


News coverage based on many years of experience from key positions in the industry. Former National Tunnel Manager at the road authorities (NO), senior principal development manager at a major tunnel contractor company (NO) and experience from a wide number of activities in national and international networks. 


Website: www.sovikconsulting.no
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