Measurement practise for road markings
4Pages

Measurement practise for road markings A hands-onguidefor retroreflectometers LTL 2000 series / LTL-X / LTL-XL We help ideas meet the real world / ROADSENSORS.COM • -ru < - _V . -£* V ->NiC - ■

Measuring retroreflection from road markings with a hand-held retroreflectometer Measuring retroreflection from road markings is important to make sure that the markings perform according to specification and thus support safe driving. But how do you compose a measuring program to provide a good overview of the condition of a road marking? What do you have to be aware of when planning and conducting the measurements? The retroreflectometer ·· f the marking is not uniform (e.g. when the road I turns, on rumble stripes, on stop markings and alike or when the marking is otherwise uneven in...

The overall purpose of measuring the retroreflection level is to ensure first of all compliance with the applied minimum retroreflection levels and secondly to confirm that the road owner received the performance level requested. And not to forget – to make sure the road is safe for driving also during nighttime and during adverse weather conditions. Conditions to watch when measuring For the European Union (EU) the CEN standards using 30 m geometry provide directions. The standard also includes recommended minimum retroreflection values on different types of roads and under different...

Retroreflection is caused mainly by the glass beads imbedded in the road markings. Depending on the quality and amount of glass beads a retroreflection level > 500 mcd/lux/sqm may be reached. A white marking without glass beads will provide limited retroreflection levels. Reflection of dry markings Retroreflection Retroreflected light Glass beads PavementGlass beads marking Pavement marking Retroreflection levels are significantly lower during nighttime driving on wet roads compared to dry roads. Moisture on markings will partly or fully cover for the light, so it will not reach the glass...