As part of the community Talking Traffic, the Traffic Light Exchange Platform (TLEX) facilitates real-time messages from and to traffic lights. All new generation traffic lights, so-called intelligent Traffic Lights (iVRI’s, intelligente verkeersregelinstallaties) are connected to TLEX as a single national platform.

In order to be able to interpret the data of each traffic light, one requires a detailed description of the topology of intersection on which the traffic light is located, so-called MAP topology (MAP is an international ETSI standard).  Since these MAP topologies are used by companies and road authorities throughout the Talking Traffic value chain, a central storage was needed.   

Commissioned by the Ministry of Infrastructure and Water Management, Monotch has built this central storage for all topologies, Topolex. The process of naming, uploading, validating, viewing and downloading topology documents is managed on this platform. Moreover, via Topolex everyone who has an interest can access all topology- and supporting documents. Topolex has also a fully automatic connection with TLEX.


“Because of Monotch’s high standards, we were able to set tough SLA’s on accuracy, reliability and latency.”

We spoke to Marcel Westerman about this project. Marcel tells us that the Ministry of Infrastructure and Water Management values working with Monotch since they have proven to be capable of executing innovative projects like TLEX. Westerman: “Working with Monotch is very comfortable. Because of Monotch’s high standards, we were able to set tough SLA’s on accuracy, reliability and latency.”


“Monotch independently looks for coordination between involved parties.”

Westerman continues: “The project team of Monotch works very independent, which makes it pleasant to work with. They independently aim for coordination between involved parties in order to get mutual agreement on common issues. As a client you do not have to stay deeply involved in the project because of their self-sufficient work approach.”


"The collaboration with Monotch is very constructive. This is the only way to go while executing an innovative project."

The Ministry of Infrastructure and Water Management is very satisfied with the result of Topolex. Monotch has met all demands and again has proven that they can create very good products and services. The user-manuals for Topolex and the planned web application make Topolex easy accessible for all kinds of users.

According to Westerman: “I would definitely recommend Monotch to parties with innovative projects in smart mobility. It is hard to fully define innovative projects up front. In an innovative project like this, you need partners that are willing and able to be flexible at all times. Monotch is very flexible and thinks in solutions. If each deviation would become an issue in this project, it could have caused many problems.

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