More than traffic flow

Traffic lights are an indispensable link in the Dutch traffic system. In order to manage the increasing volume of traffic, traffic lights are becoming even more important. We at DTV Consultants not only look at the traffic control installations; we study the whole area around them. Traffic lights are not only important for controlling traffic, but also for improving air quality and safety, stimulating public transport and making bicycle and pedestrian traffic more attractive.

Traffic lights and traffic flow
Increasing traffic intensity means growing pressure on important through routes in villages and towns. More and more cars are caught up in congestion. Good traffic light adjustment can improve traffic flow. We have launched various projects aimed at easing traffic flow. One of these is ODYSA®, a traffic control system that ensures a green wave at distances between junctions of over 1000 metres in both directions and that works for through traffic and merging traffic.
Because of our many years of experience with traffic lights, the Netherlands Ministry of Transport, Public Works and Water Management asked us to act as coach for the Green Wave Team: a team of specially trained engineers commissioned by the road manager to analyse the operation of traffic control installations and, if necessary, recommend ways of improving the traffic flow.

Traffic lights and air quality
In recent years, there has been growing attention in the traffic and transport world for the negative impact of vehicle emissions on air quality. Traffic lights can play an important role in improving air quality. A car travelling steadily causes less pollution than a braking, stopping and accelerating car. A green wave and ODYSA® are therefore also deployed for better air quality. DTV Consultants are also involved in the CROW knowledge programme SOLVE (Fast Solutions for Air and Traffic). Within the SOLVE framework, we are implementing two subprojects aimed at optimising traffic control installations for better air quality.
For these projects we work with simulation models and VERSIT+, a software module to calculate air quality based on a scientifically proven method.

Traffic lights and road safety
Traffic lights improve road safety. When traffic lights are installed on an uncontrolled junction, this results in a 50% reduction in injuries, for example. If the various junctions are then linked to each other, there are even fewer accidents. A Green Wave ensures that fewer cars need to brake. However, traffic lights do not provide optimum safety. Roundabouts are better in this respect. They can result in 80% fewer injuries compared with an uncontrolled junction. On busy roads, however, a roundabout disrupts the traffic flow, and we are therefore looking continually to find a good balance between traffic flow, air quality and road safety.

Traffic lights and public transport
In the framework of the project “Prioriteitsverlening Openbaar Vervoer” (Priority for Public Transport), DTV Consultants is implementing the KAR-technique (Short Distance Radio). This tool ensures that bus transport has priority at traffic lights. The bus driver transmits the position and speed of the bus, and KAR calculates in real-time how long the bus will take to reach the stop line. This improves priority efficiency and reduces the amount of time other traffic has to wait.

Traffic lights and bicycle use
DTV Consultants developed an Odysa® system for the bicycle. This system ensures that measures can be taken at traffic lights which guarantee that the cyclist has a green light at the next traffic light. This can be achieved by lights indicating the speed at which a cyclist needs to cycle in order to have a green light. With this development we are front-runners when it comes to improving the appeal of cycling. And there are many more possibilities for promoting bicycle traffic at traffic control installations. We are naturally familiar with them all and can provide further advice.

Traffic lights and pedestrians
For pedestrians, we have developed a new pedestrian light, the EcoGop (Efficient and Comfortable Controlled Crossing Place). The EcoGop traffic light displays the waiting and crossing times for pedestrians, so that they know what to expect. Furthermore, EcoGop uses the available time efficiently, thereby easing traffic flow for other road users.

More information?

For further information
please contact
Marcel Willekens
31 (0)76 513 6600