sujet


TRAFFIC MANAGEMENT AND TEMPORARY OPENING OF THE HARD SHOULDER MOTORWAY A9 HOLLEDAU - NEUFAHRN 1st + 2nd stage, Bavaria, Germany

, 2015

Challenge

Being one of the most important traffic Artery in Bavaria, the motorway A 9 is of great significance. Although the traffic situation could be improved between the interchanges Neufahrn and Munich-Nord after the eight-lane extension in 2005 and the existing traffic management installations, north of Neufahrn the situation got worse due to increased traffic loads. This frequently causes traffic disturbances and congestions, especially in rush hour and holiday traffic.

Details

In the area between the interchanges Holledau and Neufahrn in driving direction Munich the existing corridor control installation was renewed and extended. In direction Nuremberg a new corridor control system was installed.

The information is displayed by means of display cross-sections with VMS in LED-technology, installed at sign gantries made of spun concrete or mounted at poles beside the road.

The traffic data acquisition is mainly done via overhead detectors mounted at the sign gantries. These detectors use a combination of Doppler radar, ultrasonic and passive infrared technology for an exact data acquisition. They evaluate the traffic volumes per lane and minute for heavy goods vehicles and cars as well as their average speeds. Inductive double loops are used where a higher number of vehicle classes and a better accuracy is needed in the permanent counting stations.

Environmental data is detected by means of visibility sensors (scatter measurement) and precipitation sensors (volume and type of precipitation with Doppler radar measurement) evaluating the quantity of water on the road. At some locations, additional sensors in the road evaluate data such as water film heights, freezing temperature and road surface temperature for road service means. The display points as well as the detectors for traffic acquisition and environmental data are connected to the outstations which carry out the communication with the traffic computer.

The data transmission between the outstations and the controlling traffic computer of the sub center located in the traffic and operation center (Verkehrsrechner- und Betriebszentrale) for southern Bavaria in Munich-Freimann is done via high-performance fiber optic network. Also in the traffic and operation center the system is operated and visualized.

The temporary opening of the hard shoulder was integrated in the traffic management system in driving direction Nuernberg from the inter­change Neufahrn to the interchange Holledau and in driving direction Munich from the parking and rest area Holledau to the junction Allershausen. To do so, the following system parts were added:

  • Variable message signs analog to the corridor control system between the right hand lane and the hard shoulder as well as above the hard shoulder,
  • Traffic data acquisition with overhead detectors for the hard shoulder,
  • Signs for permanent use of hard shoulder (opening / closing / end of the hard shoulder running) on the right hand lane together with permanent light signals (green arrow, red X, yellow blinking arrow) in LED-technology mounted overhead,
  • Fourth lane indicated within the variable routing by means of prism openers,
  • Pan-tilt-zoom video cameras on poles, cantilevers and gantries to monitor the hard shoulder (free of obstacles) and
  • Video network via fiber optic cable with video center in the cable house Holledau.

Additionally, for the temporary use of the hard shoulder, every 500 m to 1,000 m lay-bys and acceleration / deceleration lanes are implemented at service areas and nodes. In some parts the hard shoulder was enforced.

The fourth lane is indicated within the variable routing by means of prism openers. Pan-tilt-zoom video cameras on poles, cantilevers and gantries observe and monitor the hard shoulder from the video center in the traffic and operation center.

In peak traffic times at the motorway A 9, the traffic controller recommends the temporary opening of the hard shoulder. Before the operator releases the hard shoulder, the video cameras of the intelligent video center scan the relevant section and check whether it is free from obstacles and ready to be used. Additionally, in the future the operator will be supported by an automatic detection in the sections already checked and released for traffic.

After the hard shoulder was opened, the system can also be used to analyze and monitor the traffic and to detect congestions, stopped vehicles, obstacles, wrong way drivers or occupied lay-bys and to report it to the operator.

Once the traffic volume decreases or in case of incidents (e.g. accident, stopped vehicle, vehicle in lay-by) the hard shoulder will be closed. After a period of transition the normal state of operation with a regular three-lane road is valid. The hard shoulder resumes its original function as emergency lane.

Project content (dir. M. / dir. N.)

  • Length corridor control ..............35.6 km / 34.1 km
  • Length hard shoulder run. .........26.3 km / 29.5 km
  • Display cross-sections
    with VMS / permanent
    light signals
    - Gentries ......................................21 pcs. / 21 pcs.
    - Cantilevers ......................................6 pcs. / 7 pcs.
    - Poles ...............................................3 pcs. / 0 pcs.
  • Display cross-sections
    with signposting ................................8 pcs. / 7 pcs.
  • Display cross-sections
    with static signposting .......................4 pcs. / 4 pcs.
  • Display cross-sections
    with signs for hard
    shoulder running ............................28 pcs. / 27 pcs.
  • Traffic data
    - Overhead detectors .....................91 pcs. / 75 pcs.
    - Induction loops ............................23 pcs. / 15 pcs.
  • Visibility ............................................37 pcs. / 7 pcs.
  • Humidity ...........................................15 pcs. / 8 pcs.
  • Ground sensors .............................18 pcs. / 18 pcs.
  • Video locations ..............................73 pcs. / 81 pcs.
  • Outstations
    - new ..............................................31 pcs. / 35 pcs.
    - refitted ...........................................15 pcs. / 2 pcs.
  • Length new cable
    - Data cable (fiber optics) .................72 km / 54 km
    - Energy cable ..................................26 km / 33 km
  • Energy
    - Connection locations .......................9 pcs. / 3 pcs.
    - Distribution locations ...................34 pcs. / 15 pcs.

Benefits

The first stage of construction stretches from the junction Allershausen to the interchange Neufahrn in both driving directions. The partly finished second stage extends the installation from the interchange Holledau to the junction Allershausen in driving direction Nuernberg and allows for a hard shoulder running in the section between the interchanges Neufahrn and Holledau.

The corridor control installation between interchange Holledau and junction Allershausen in direction Munich was finished in July 2015. The hard shoulder running in between the service and rest area Holledau and the junction Allershausen in direction Munich will only be possible after certain road adaptations. These constructions are to be implemented in 2016 so that by the end of 2016 / in the beginning of 2017 the hard shoulder running will be stretch from the service and rest area Holledau to the interchange Neufahrn.

 

Start of operation 1st stage: December 2012
Start of operation 2nd stage:
- Dir. Nuernberg (SBA+TSF): March 2015
- Dir. Munich (SBA): July 2015
- Dir. Munich (TSF): End of 2016 / beginning of 2017