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ASIM Traffic Detectors

Founded in 1989, and part of Xtralis since 2007, ASIM provides market-leading traffic detection solutions featuring Swiss manufacturing and the highest quality materials and craftsmanship. Based in Uznach, SG, Switzerland, the company has sold more than 60,000 detectors worldwide.

Overhead traffic detectors

Our overhead traffic detectors provide the lowest installed costs with the same accuracy as inductive loop systems. They ensure longevity, with only minimum maintenance required, and have an extended operating temperature range (-40°C to +70°C).

Day and night traffic detectors

Effective traffic management and control require reliable traffic detectors that are easy to use and do not need expensive road work or cause traffic disruptions during installation or replacement. ASIM above-ground traffic detectors are easy to install, maintain and operate 24/7 for accurate acquisition of traffic data and effective control of intersections.

ASIM traffic detectors use a variety of technologies for optimum performance in numerous applications.

Doppler radar/microwave traffic detectors

Microwave traffic detectors emit focused high-frequency signals within a specified frequency band in the GHz region. A vehicle moving into or through the detection area reflects the signals back to the detector. From the Doppler shift between the emitted and received frequency, the direction and speed of a vehicle can be determined with great accuracy.

Passive infrared traffic detectors

Passive infrared traffic detectors sense the slightest changes in thermal radiation contrasts against the background that result from any moving object or body in the field of view. ASIM passive infrared traffic detectors are available for request and extension of green phase in traffic-dependent applications for control of intersections, as well as for counting, occupancy measurement, presence detection, queue detection, speed assessment and classification by vehicle length.

Ultrasonic traffic detectors

Ultrasonic traffic detectors emit high-frequency acoustic signal bursts beyond the audible range of humans and most animals. A vehicle moving into or through the detection area reflects the signals back to the detector. The distance to the surface of a vehicle is measured from the travel time of the ultrasonic bursts.

As a result of this active measurement, the presence of standing vehicles can be detected and continuously monitored (unlike with passive infrared or radar sensors, which require movement). It also allows for precise counting and classification when combined with other technologies.

Combined-technology traffic detectors

By combining two or more technologies in a single detector, optimised solutions for a variety of applications become possible. Such products are particularly useful in more demanding applications, such as stop bar presence or acquisition of traffic data.

Traffic-data acquisition (TDA) traffic detectors

TDA refers to the counting and speed assessment of traffic, as well as classification by vehicle length or type, for a variety of permanent and temporary applications. ASIM combination detectors are mounted above the observed lane, while multi-channel PIR detectors can also be mounted on poles at their sides.

Data transfer occurs by two-way RS 485 bus. Ultra low-power PIR detectors for solar-powered installations are also available, as well as triple-technology detectors for accurate TDA, including speed and vehicle class for statistics applications.

TDA detectors available include the TT29x, DT35x and IR25x series.

Intersection control (ISC) traffic detectors

For ISC, our detectors use various technologies to safely recognise vehicles or pedestrians. Direction, speed or lane-selective operation enables precise traffic-dependent requests and extensions of green phases. Further applications include counting, time-gap recognition or presence-detection of vehicles waiting at the stop line.

ISC detectors include the DT37x, MW33x and IR30x series.

Highlights include:

  • Reliable, maintenance-free operation in all weather and lighting conditions
  • Accurate traffic data
  • Ultra low-power models available

Key benefits include:

  • Low total cost of installation
  • Increased road traffic safety
  • Minimised pollution through optimised traffic flow

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Xtralis UK Ltd

Vision House

31 Mark Road


Hemel Hempstead



United Kingdom

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Xtralis UK Ltd

Vision House

31 Mark Road


Hemel Hempstead



United Kingdom

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