Dynamic Traffic Control

Reacting on the Current Traffic Situation.

The use of highly energy-efficient LED Variable Message Signs (VMS) allows to convey dynamic information to the road users in line with the current traffic situation. Speed funnels help avoid rear-end collisions when traffic flow comes to a halt. During the rush-hours, the hard shoulder can be flexibly assigned the status of an additional lane, providing an additional 25% capacity on the existing road network. Dynamic route information panels indicate alternative routings in case of traffic jams or road blocks. Weigh-in-motion technology is used to monitor overloaded heavy goods vehicles.






Traffic Flow



Major Applications

The network wide management of traffic flows optimally uses the capacity of the whole motorway network.
Traffic problems on one motorway are no longer considered local but solved in a supra-regional context, national and cross-border.


  • Capacity increase by using the entire motorway network
    for route recommendations


  • Large-size, dynamic and programmable variable message signs (VMS) inform the road users about alternative routes and congestions
  • A central software evaluates the situation and controlls and activates the VMS via their road side units.
  • The VMS display informs about congestions and gives diversion recommendations using stored content (messages) according to the current situation.

Ramp metering installations reduce the flow of vehicles entering the motorway by breaking up the flow of cars into groups and thus ensuring that the traffic can merge more easily.


  • Harmonization of the traffic on the main lane

  • Reduction of accidents by up to 40 %

  • Reduction of congestion by up to 50 %

  • Increase of traffic volumes by up to 10 %
    at peak times


  • Traffic lights on the ramp to the motorway let only pass one or two vehicles at a time to enter the main lane of the motorway.

At peak times in the morning and evening rush hours or during the holiday season, the road capacity is often quickly exceeded and road works or accidents bring traffic to a halt.


  • Increase of traffic volumes and decrease of travel
    times during peak traffic hours


  • When the traffic load exceeds the threshold, the traffic controller recommends the temporary opening of the hard shoulder.
  • The video cameras of the intelligent video center scan the relevant section and check whether it is free from obstacles.
  • Once the traffic volume decreases or in case of an incident, the hard shoulder will be closed again for traffic. After a period of transition, the normal operating state is valid and the hard shoulder resumes its original function as emergency lane.

The weight of vehicles has a substantial impact on the condition and performance of infrastructures such as roads and bridges. WiM systems ensure that prices are fairly charged with respect to vehicle characteristics. In addition, the enforcement of vehicle weight limits can decisively improve traffic safety.


  • Damage reduction for roads

  • Saving of investment costs for maintenance

  • Increased driver safety

  • Pre-selection in traffic surveillance


  • Inductive loops / strip sensors / fiber-optic sensors collect vehicle data (presence, length and classification / axle loads)
  • Automatic overload detection
  • Detection of gross weights and axle loads
  • Individual data for each vehicle

Traffic control in tunnels and on tunnel ramps, visualization of the facility management system (FMS) in the tunnel


  • Monitoring and control of facility and traffic management
  • Effective traffic flow and fast tunnel closure in emergency cases such as fire, smoke, accidents
  • Warning of congestion or construction works
  • Early information and safe rerouting of the traffic
  • Harmonisation of traffic flow in unbalanced traffic situations
  • Traffic monitoring


  • Monitoring and control of facility and traffic management
  • Bi-directional traffic lane control
  • Traffic data acquisition
  • Traffic incident detection
    • Wrong way driver
    • Fire
    • Smoke
    • CO2 Contamination
  • Interface to the SCADA
  • Interface to the camera monitoring system
  • Traffic control at the tunnel portal
    • Signalisation
    • Traffic lights
    • Environmental conditions
  • Control barriers

Automated systems for check-points of heavy goods vehicles


  • Safer working conditions
  • Less personnel needed
  • Automated diversion of vehicles via software


  • ANPR cameras capture licence plate
  • Video cameras show detected vehicle
  • Data is transmitted to an intelligent outstation
  • Checking personnel selects vehicles to be diverted for inspection via browser-based software
  • Licence plate displayed on VMS prompts driver to exit at the checkpoint