COVID-19 – Continuing to Care for Our Global Family of Customers, Vendors and Partners CLICK HERE for information

Contact Us


Piezoelectric Sensors

Piezoelectric RoadTrax BL

The Roadtrax BL Sensor (named for what it looks like—a Brass Linguini) can be installed directly into a slot in the road for permanent applications or taped down for portable applications. Highly accurate for speed and classification, robust, low cost, easy to install, and offering a great signal-to-noise ratio, these sensors offer tremendous value.

Roadtrax BL sensors are unencapsulated, conforming to the road profile and giving a clean easy-to-read signal that translates into accurate vehicle count, speed and Weigh-In-Motion (WIM) data. The BL sensor is available both as a Class I sensor for the highest level of uniformity needed for WIM applications, and as a Class II sensor which is more cost effective for counting, classifying, high speed toll booths, and speed detection.

Both the Class I and the Class II sensors are available in a variety of different lengths from 6 to 13 feet, with standard cable lengths of 100 feet or more (Metric from 2 5.5 meters, cable lengths from 35 100 meters). These sensors are directly compatible with all counters and WIM systems that have piezoelectric input.

  • The BL sensors' unique flat design results in a more accurate count by rejecting road noise and reducing "ghost axles"
  • Constructed with proven components and assembled in a unique way to improve longevity and uniformity
  • Easy installation with relatively small road cut and flexible sensor to conform to any road profile
  • Can be used in portland cement or asphalt
  • Withstands >40 million ESAL (Equivalent Single Axle Loads) with correct installation
  • Detects axles ranging from bicycles to the heaviest trucks
  • Flexible and easily transported; the sensor may be rolled for shipping to the installation site


Output Uniformity: ±20% for Class II (Classification), ±7% for Class I (Weigh In Motion)
Operating Temperature Range: -40ºF to +160ºF (-40ºC to +70ºC)

IRD Worldwide