As part of the funding of projects supporting "digitization of municipal traffic systems", more and more dynamic guidance systems are being implemented in order to improve inner-city traffic flow. Currently, the Rosenstein Tunnel is being built in Stuttgart to relieve a bottleneck affecting the main road network. PTV Transport Consult has been entrusted with the planning of the dynamic traffic control technology for the new tunnel.
Traffic control system for the new Stuttgart Rosenstein tunnel
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Since 2014, the approximately 1.3-kilometer-long Rosenstein Tunnel has been under construction in Stuttgart to connect the two districts of Zuffenhausen and Stuttgart East. The traffic control system will be adapted accordingly. To ensure safe and efficient operation of the tunnel, dynamic message signs will be used to direct and divert traffic in case of specific incidents (e.g., altitude alarm, fire, maintenance closure).
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Traffic engineering
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Dynamic traffic management systems communicate traffic conditions, provide alerts and help direct traffic flexibly, as needed - for example, in the event of incidents in the tunnel or on the access routes, when tunnel tubes are closed or to direct traffic during events in the nearby NeckarPark.
PTV Transport Consult experts were responsible for setting up the system architecture, which includes various elements such as 11-meter-wide LED displays, LED variable message signs, continuous light signs, and sensors for truck height warning. In addition, the entire system is prepared for the use of V2X communication, i.e. vehicle-to-everything communication that enables networking of vehicles with each other and with the infrastructure. This technology is required for autonomous driving, for example. All relevant data and characteristic values are made available via so-called roadside units.
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Software
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Stuttgart’s traffic computer was redesigned to control the traffic management system, which is operated by Stuttgart’s Integrated Traffic Control Center (IVLZ).
The traffic computer, which is based on open-source software, takes over the control of all existing traffic engineering elements, with the exception of signal controls. In addition, the signal control computer and the tunnel operating systems are connected via corresponding interfaces. This enables automatic selection and switching of closure scenarios right down to individual signal control programs.
At the IVLZ, operators from the Civil Engineering Office, the Office of Public Order (AföO), Stuttgart’s public transport operator SSB and the police work together to optimize traffic flow in the city area across all modes of transport. All operators need to have access to the new traffic computer. Therefore, additional interfaces to other systems are required. These include:
• AföO traffic information and approval tool
• SSB’s camera system
• Integrated control center providing data on emergency services (police, fire brigades)
• Open Data Portal of Transport Association Stuttgart VVS
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Key facts & figures
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New and/or upgraded traffic technology required for the new tunnel in numbers:
• 11 vario panels, LED full matrix large surface
• 39 vario signs, LED full matrix small surface
• 33 variable message signs (VMS), LED matrix plugged, small surface for display of specific graphics, texts or images.
• 97 permanent lights for lane signalization
• 68 traffic detectors (radar sensors and induction loops)
• 29 roadside units
• 4 height measuring systems with laser detectors and video system on tunnel approach routes
• 12 traffic observation cameras (not in tunnels)
• 8 blocking points with remote controlled barrier systems
• 12 gantries
• 57 static signposts
• 13 route stations
• Rewiring of approx. 55 km of cables