Optimising Traffic Flow in Road Networks

Optimal use of traffic space
shift traffic flows
consider alternatives



Local measures for traffic control may eliminate incidents on specific routes to a certain degree or may reduce their impact. In case a route is too heavily loaded anyway, traffic flows may additionally be shifted to alternative routes, if such alternatives do exist in the network. These shifts may be achieved using rerouting advices for affected road users.

A network model with mapping of main and alternative routes provides the base for the rerouting application. The decision to give a rerouting advice should not only be based on the current traffic situation. Short term and middle term predictions of the development of the traffic situation have to be considered as well, on one hand to be able to react in time, on the other hand not to react too quickly on situations of short duration. Decisions will be taken using a historic, statistical data base, which represents typical traffic patterns in the network, taking account of classified events.

The current traffic situation is particularly taken into account using a method for congestion detection with calculation of travel times, which predicts the progression of the congestion.

Using the available information about main and alternative routes, an optimal route inside the network can be determined applying a rule based decision logic. ‘Meta’ programs may be defined to realise complex, combined rerouting measures.

The systems offers decision support to the operator, since in many cases a fully automated activation of rerouting measures is not desirable and human intervention is necessary. After a corresponding check-up, the operator decides whether to activate the measure or not.

The architecture of our systems provides open interface.