ECE Regulation No. 39 establishes uniform provisions for the approval of vehicles with regard to speedometer equipment. This regulation is essential to ensure that vehicles are equipped with accurate and reliable speedometers, which contribute to road safety by providing drivers with precise information about the vehicle’s speed.

This regulation specifies the technical standards for the construction, installation, and performance of speedometer equipment. Speedometers must be designed to accurately display the vehicle’s speed under various operating conditions. The regulation also requires that the speedometer be easily visible and readable to the driver, enabling effective speed monitoring at all times.

To ensure compliance, the regulation defines precise test procedures. These tests include assessments of accuracy under various speeds and environmental conditions such as temperature changes and vibrations. Manufacturers are required to perform these tests to demonstrate that their speedometer equipment meets the required standards. The regulation also includes provisions for the calibration and maintenance of speedometers to ensure they retain their accuracy throughout the vehicle’s lifespan.

Regular inspection and maintenance of speedometer equipment are mandatory to prevent inaccuracies caused by wear or tampering. The regulation provides guidelines for periodic checks and servicing to ensure the continued reliability and accuracy of speedometers.

TAT Laboratory is authorized in Iran to perform testing and issue certifications for compliance with ECE Regulation No. 39. This includes conducting all necessary evaluations to ensure that speedometer equipment meets the specified standards. By performing these tests, TAT contributes to enhancing road safety in Iran and ensures that vehicles are equipped with accurate and reliable speedometers.