Road marking is the silent language of the road, and its effect is particularly obvious at night. The average accident rate at night is much higher than during the day, especially on rainy nights, the incidence of traffic accidents is higher, and the role of road markings is more important. This requires that road markings must have a reflective effect at night. Since the retroreflection coefficient of road markings will decrease as the traffic wears, it is necessary to regularly measure the traffic markings to ensure that the road markings are provided to the driver with sufficient safety and visibility.
Standard | Retroreflective performance requirements of reticle under wet conditions
standard requirement
GB / T 16311-2009 “Quality Requirements and Testing Methods of Road Traffic Markingsâ€, implemented since April 1, 2010, stated in 5.6.3 that “Rainy night markings should have retro-reflective performance under wet conditions and have good performance in rainy night Recognize the effect. "
This standard has been implemented for 8 years, and the road traffic environment has undergone tremendous changes. The relevant standard revision should not be too far. The American ASTM standard and some local standards have made clear requirements for the retroreflective performance of the marking line under wet conditions. Therefore, this revision will inevitably include the requirements and detection methods of the retroreflective brightness coefficient of the rainy night cursor line in the new version of the specification.
American standard
American Standard ASTM E2177-2009 "Standard Test Method for Measuring the Coefficient of Retroreflected Luminance (RL) of Pavement Markings in a Standard Condition of Wetness" (standard test method for measuring the retroreflected brightness coefficient of pavement markings under wet conditions) ： In the rainy night, the retro-reflective brightness coefficient of the white anti-cursor line should not be lower than 200mcd / lux / m2; the yellow line should not be lower than 175mcd / lux / m2.
Various places have begun to issue standards on the quality requirements and testing methods of rainy night road traffic anti-cursor lines
â— Jiangxi Province will implement DB36 / T978-2017 "Quality Requirements and Testing Methods of Reverse Cursor Lines on Rainy Night Road Traffic" from January 1, 2018
â— Sichuan Province will implement DB51 / T2429-2017 "Quality Requirements and Testing Methods of Reverse Cursor Lines in Rainy Night Highway Traffic" from October 1, 2017
In the standard, the requirements of the minimum retroreflective brightness coefficient of the anti-cursor line of road traffic under dry, humid and continuous rainfall conditions are clearly stated.
How to solve the detection problem under continuous rainfall conditions?
The national standard implemented in 2010 has introduced the concept that the rainy night marking should have retroreflective performance under wet conditions, but the test instrument for the retroreflective brightness coefficient of the marking under wet and continuous rainfall conditions is special, so it is not This version of the national standard makes clear requirements. However, in the local standards issued in the past two years, the requirements for this item have been gradually refined and clear, and even the quality requirements and detection methods of the rainy night anti-cursor line have been specifically issued. So how to effectively measure the retroreflection coefficient of road markings under humid and continuous rainfall has become an urgent problem to be solved.
The instrument for measuring the retroreflected brightness coefficient of the reticle under wet conditions and continuous rain conditions is special. It needs to be able to meet the detection under dry, wet and continuous rain conditions at the same time to meet the requirements of relevant standards. The LTL-X MarkII handheld road marking retroreflective measuring instrument from DELTA of Denmark can meet the measurement of RL (night visibility) value under the above three conditions at the same time.
LTL-X MarkII host and accessories
LTL-X Mark II road marking retroreflective measuring instrument
LTL-X Mark II is an advanced testing equipment with simple operation and long life. It integrates the most advanced lighting and sensor technology, and uses the optical system of DELTA's gradient direct technology, which can measure all types of smooth marking lines and cross-sectional marking lines. The sensor system integrates the human eye corresponding to the International Commission of Illumination (CIE) and A light source requirements, and meets the requirements of CEN and ASTM for cross-sectional height and color.
LTL-X MarkII optical schematic
Features
â— RL (Night Visibility) in wet and dry conditions and continuous rainfall
â— Color LED screen for easy reading
â— Night visibility (RL) measurement
â— Measure smooth and 15 mm / 0.6 ft cross-section markings
â— Statistics of measurement results
â— Data storage and output
â— RSC software for PC download
â— One-handed operation, convenient for users
â— Scattered light compensation
â— Maintenance-free LED lights
Live demo of LTL-X MarkII
Device main interface
fulfill the standard
â— American Standard: ASTM E1710 (RL); ASTM E2176 (RL Continuous wetting); ASTM E2177 (RL Wet); ASTM E2832 (RL Continuous wetting)
â— European standard: EN1436 (RL & Qd) (night visibility and day visibility)
â— Chinese Standard: GBT 16311-2009 "Quality Requirements and Testing Methods of Road Traffic Markings"; GBT21383-2008 "Initial Retroreflectance Luminance Coefficient and Test Method of Newly Marked Road Markings"; JT-T612-2004 "Retroreflective Measuring Instrument" ; DB36 / T978-2017 "Quality requirements and testing methods of anti-cursor lines in rainy night road traffic"; DB51 / T2429-2017 "Quality requirements and testing methods of anti-cursor line in rainy night traffic"
Principle of continuous rainfall detection
LTL-X Mark II can measure the retroreflective value of road markings under continuous rainfall according to ASTM E2832. The LTL-X Mark II uses two rails installed under the instrument to move the measured light area directly in front of the device. It can measure the retroreflection coefficient of the reticle under natural or artificial rainfall conditions.
Install the track under the device when measuring continuous rainfall conditions
The retroreflective performance of the road markings measured under the conditions of simulated continuous rainfall can reflect the performance of the road markings under the real rainfall environment on the road. The simulated reflection device is used to test the change of the retroreflective value of the road markings under the continuous rainfall environment So as to provide a certain reference for the rainy night retroreflective performance of road markings.
Spray device for simulating continuous rainfall environment
On-site demonstration of a spray device simulating continuous rain conditions
For more product information, please contact DELTA China exclusive agent service provider in Europe and America.
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