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Construction of the Bypass (L697n) and the Hestenbergtunnels
Freitag, 5. Dezember 2008 
Construction of the Bypass (L697n) and the Hestenbergtunnels in Plettenberg (North Rhine-Westphalia)

Control of co-ordination via KuS and video technology either traffic-dependent of from the tunnel control center.

In coordination with the construction of the Westtangente (L697n) and the Hestenbergtunnel which is connected to it in Plettenberg, authorities have closed of the Böddinghauser Weg at the north side of the tunnel and the Bahnhofstraße on the south side.

These new intersections will be controlled in the future through light signal systems. The goal of these systems is, in par,t to control the normal traffic flow on the highway, while also allowing for a timely reaction to accidents or closures of the tunnel.

During the night, the signal systems will run with a traffic-dependent control. During the day they are synchronized with a co-ordination and control facility (KuS) which is harmonized with the neighboring signal systems.  Since the KuS is connected to the tunnel control center, the notifications can be sent not only to each individual signal system, but also the tunnel control system. The individual signal systems then send notification back to the KuS.

If an accumulation in wait times were to occur as a result of an accident in the tunnel, the tunnel’s control system would then send the necessary information to the KuS, which would in turn forward the information to the needed light signal systems.

Potential notifications range from partial blockage of a single lane, complete blockage of all lanes or an accident (i.e. fire in the tunnel).
 In reaction to accidents or potential closures of the tunnel, the light signal systems react immediately and switch as fast as possible to a tunnel clearing phase. The vehicles in the tunnel will, as a result, receive free passage until the system detects all vehicles have left the tunnel and it is possible to clear it. The signal systems in the direction of the tunnel begin to allow no passage at this point. All other traffic receives a passing time that is suitable for the situation.

If the tunnel needs to be closed in one direction or if a complete closure is required due to construction or other build ups (not accident related), the system will use, instead of its emergency setting, its setting for partial closures. In contrast to the emergency setting, there is no need for an immediate clearing of the tunnel; rather, it can be deferred to the reaction of the required system setting. The light signal systems will at this point be set up independent from normal traffic flow and use an individual control setting, whereby the signal systems in the direction of the tunnel will no longer allow for free passage. Traffic flow will receive, as a result of the varied situations, suitable passing times. 

Drivers obtain instant notification as to wait times and closures through interchangeable traffic signs and signal transmitters. The light signal systems will confirm the input of various notifications to the tunnel control system and send a suitable answer via a co-ordination and control facility, as soon as the desired setting has taken effect.

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