On request of the customer the existing loop detection system in the Huguenot-tunnel, a toll tunnel, was replaced by an automatic incident detection (AID) system with VIP23 and VIP41.

The Huguenot-tunnel is a two-lane carriageway of 3913 metres. There is two way, leftside driving traffic. The main control centre is 6 km from the nearest end of the tunnel (Western portal, Capetown). The AID system (13 cameras) stands apart from the CCTV system.

The main function of the Video Based Traffic Monitoring System (VBTMS) is the detection of traffic flow events within the tunnel and its approaches. It consists of VIP modules, a communication module & the WATTS PC-software.

The video signals of the 13 cameras in the tunnel are fed into the VIP modules in the control centre.

The AID system provides video image processing to detect following conditions:

• Stopped vehicles
• Slow moving traffic
• Traffic queues
• Overspeed
• Wrong-way drivers

In tunnel sections, a VIP23 provides detection of stopped vehicles & queues and flow monitoring. At the tunnel portals outdoors, a VIP41 and a VIP2 are combined per camera. VIP41 handles the stopped vehicle detection. VIP2 provides standard traffic data collection (such as volume, speed, length class).

Alarms are generated when a vehicle stops on the predefined zones or when a queue is detected in one of the predefined detection zones.

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