We have extensively talked about LIDAR technology in the article: “THE REASONS WHY YOU SHOULD USE THE LIDAR TECHNOLOGY TO DETECT AND CLASSIFY VEHICLES – click here if you want to read the article:  

In this article, we will analyze a laser scanner sensor, called RASER which is part of the sensors family that use LIDAR technology.

Why RASER? Because this kind of sensor uses a double technology: the laser scanner (Lidar) technology and the radar one, hence RASER.

Radar is an acronym that stands for “radio detection and ranging” or said in other words “radio detection and distance measurement.” This system uses radio or microwave electromagnetic waves to detect and determine the position and speed of both fixed and mobile objects.

Radar designed for speed monitoring exploit the Doppler effect and are therefore called Doppler radars.

But what does doppler effect mean?

For example, when we hear the ambulance’s siren, you can easily note that the tone changes as it overtakes. This is due to the fact that the ambulance first approaches us and then moves away, thus changing the speed from positive to negative (travelling from one direction to the other).

Therefore, RSR4001 is a sensor that uses both laser scanner and doppler radar technology.

Why combining those two technologies?

The radar that uses microwave technology and in particular the Doppler effect is used to measure with high accuracy the vehicles speed.  The detected speed is used to determine the traffic’s conditions (normal, slowed down) allowing motorway dealership to warn drivers and to opt for an alternative route and therefore providing a service to the citizen.

The laser scanner, on the other hand, counts and detects the profile of the vehicles allowing a precise classification of transits. Specifically, RSR4001 is able to count and distinguish more than 20 vehicle classes from motorcycles to articulated lorries.

This combination makes this sensor unique and complete in its kind as it is able to provide all the main data necessary for detecting traffic.

Not only that, the sensor has been designed to work even in adverse weather conditions. The temperatures of use can range from -20 ° C to + 60 ° C. Furthermore, thanks to radar technology, the fog does not create any problems in detecting traffic. The sensor is also very robust and compact.

The sensor has been designed to cover the entire width of the lane and can therefore also detect motorcycles that tend to pass more on the sides than in the center.

Another important element is that they do not need maintenance and the RASAR includes the CPU for the data analysis.

The data detected by the RSR4001 are:

  • Counting
  • Classification
  • Speed
  • High
  • Length
  • Traffic status
  • Real-time traffic detection

Therefore, the sensor is perfect to be installed in tolls; in traffic monitoring; as a trigger for cameras.


Our RSR4001 have been installed on Italian motorways:

  • Variante di Valico Bologna – Firenze
  • Mestre ring road
  • A4 MILAN ring road
  • Rome ring road


  • Thailand
  • Malaysia
  • South Korea
  • Argentina
  • England