Your Specialist
Worldwide No. 1 in selling fiber optic sensors for road traffic applications


Our fiber optic road sensors
100% Vehicle detection rate - EMV immune and noise free - Visibility independent


Our fiber optic rail sensors
Easy installation - EMV immune and noise free - Vertical wheel load


Made in Germany
Competence Center for fiber optic sensor technology in Schrobenhausen

Sensor Line celebrates its 25th anniversary

On May 28, 1996, Fritz Motzko realized a long-cherished wish and founded his own company in Schrobenhausen, Sensor Line GmbH. The brilliant idea of developing sensors for road and rail traffic from optical fibers was the igniting spark.

Read more

IRD acquires Sensor Line GmbH

Sensor Line has been acquired by International Road Dynamics Inc. (IRD) as a wholly owned subsidiary. We are joining the IRD portfolio of products and solutions for Intelligent Transportation Systems (ITS) globally

Read more

New York State Thruway project

We are very proud to be an important part of creating a safer, greener and less congested environment for all NYS commuters.

Read more

Prepared for the future

Sensor Line’s mission is to create the single best sensor technology and ITS and ETC sub-system for collecting and providing vehicular characteristic data with the highest possible accuracy and reliability for traffic monitoring applications.

Welcome to our World

Sensor Lines unique fiber optic sensing technology allows us to offer the most accurate and reliable and thus most cost effective vehicle detection and classification sensor for traffic monitoring. The sensors are especially designed and particularly suitable for electronic toll collection (ETC) and intelligent transportation system (ITS).

Sensor Line is now Quarterhill.

Quarterhill was launched to fast-forward the transportation industry into a safer, smarter, and more digitally-connected future. Starting soon sensorline.de will transport you to Quarterhill.com

Thank you for joining us on this exciting journey.

Discover Quarterhill

Further, Faster, Smarter