Improving Traffic Flow

Improvement of the quality of the traffic flow
avoiding economic damage
reducing road construction costs
reducing environmental impact



Based on the current and predicted traffic situations, an improvement of the traffic flow can be achieved using appropriate traffic control methods. In addition to algorithmus with local effect, rerouting strategies have especially proven to be effective, recommending alternative routes in the road network to motorists. Specialised methods are used to take safety in tunnels into account.

An effect on traffic flow is achieved using variable message and traffic signs, by adapting speed limits, indicating warnings or directives, presenting information, or giving rerouting advice.

Our systems support the following methods for local traffic control:

section control with automatic or manual speed harmonisation, congestion or emergency warning etc.

ramp metering at slip roads reducing negative impact on heavily used highways

temporary use of hard shoulder adding an additional lane during peak hours

traffic control in intersections with dynamic lane assignment depending on traffic demand in the intersection


The indication of rerouting advices is used to control traffic flow in networks. The traffic situation on main and alternative routes is the basis for rerouting decisions, which are calculated by a decision logic, taking short term predictions into account and leading to appropriate rerouting measures.
An additional effect can be achieved by disseminating information to the road users, who will then take their own decisions.

The specific situation in conurbations can be taken into account by interconnection with the urban traffic centre. A traffic system management realises a strategic management involving road operators both on regional and urban level.

Finally, the reduction of the negative impact of operational work, e.g. by optimised planning of roadwork or winter service, will have an indirect, positive influence on traffic flow.