Rijkswaterstaat is replacing thousands of outdated roadside systems with a new generation of intelligent roadside traffic signaling systems. This is exactly what is happening now (from 13 October to 7 November 2025) on the A1 between the Muiderberg and Eemnes interchanges. Therefore, this section is partially closed on weekdays between 9:00 PM and 5:00 AM.
A large-scale project, so it is good to consider the questions: why are we doing this and what really happens during these works?
First of all, it is important to clarify that rolling out new traffic signaling systems is more than just replacing the roadside systems. These are the grey boxes we see along the road. It also involves the signal devices hanging above the road.
Furthermore, rotating signs, which do not need to be replaced now, are also part of traffic signaling. Managing traffic on rush-hour lanes is a combination of the images on signal devices and the images on the rotating panels.
Why is the traffic signaling being renewed?
The systems are outdated and need replacement. Many roadside systems date back to the 1990s and have reached the end of their technical and functional lifespan. Additionally, hardware and software come from different suppliers. Maintenance is difficult and time-consuming.
We are now taking the opportunity to apply standardization, which makes management more efficient. Stability and reliability are also improved, partly by replacing copper connections with fiber optics. This makes it possible to manage the system remotely and often fix malfunctions without a technician on site. This is essential for road safety and traffic flow.
Finally, the signal devices above the road, mostly still containing halogen lamps, are replaced by devices with LED lighting, saving energy. By modernizing, the traffic signaling is ready for the future. The new systems are prepared to communicate with in-car systems, a development that is unstoppable.
How are the works carried out?
The work on the A1 from Muiderberg to Eemnes (and vice versa) has started and takes place on weekdays between 9:00 PM and 5:00 AM. The contractor tackles about 3 km per week, completing the total 12 km in 4 weeks.
To ensure the safety of road workers, the relevant section is closed in both directions for all traffic. Some portals, where the matrix signs are attached, cover both directions.
During the works, traffic can use the route during the day. People must take some measures into account, especially because the traffic control center cannot operate the signal devices. These include:
- Speed limit of 70 km/h.
- Text trailers and cone teams are ready.
- Crash absorbers are on site.
- Rush hour lane is continuously open.
This equipment and personnel effectively replace the signaling, which is out of use during the works.
Smart future: data and connectivity
An intensive research period preceded the rollout of intelligent traffic signaling systems. Since 2014, prototypes have been tested for heat, vibration, electromagnetic radiation, and reliability. Initially, it was thought that in-car information systems would make traffic signaling obsolete. Developments are just not progressing that fast yet.
The new generation of roadside systems forms the bridge to smarter infrastructure. While the old systems only received information from loops in the road surface, the new boxes will also use data from vehicles and apps. This allows us to monitor traffic flows more accurately and respond faster to incidents, even where no detection loops are present.
The renewal of roadside systems is thus not only a maintenance project but also a step towards ‘smart mobility’: a digitally connected infrastructure where road, vehicle, and driver interact better. At the same time, maintenance and management become easier, aiming for a well-maintained infrastructure that provides us freedom of movement.
