Report of the first round robin test for mobile reflectometers: research carried out in the frame of the activities of CEN/TC 226/WG2

Luc Goubert

Mobile reflectometers for measurement of road marking retroreflectivity have been commercially available since the late 1990’s. It has been speculated that measurement errors are larger for these mobile instruments than for the traditional hand-held reflectometers. In order to get basic data for a new standard, CEN/TC 226/WG2 asked the Expert Panel to investigate measurement accuracy of mobile reflectometers. This investigation was carried out in a round robin test, in which the three most commonly used instruments in Europe participated: Ecodyn 30, LTL-M and Zehntner ZDR 6020. Two instruments of type Ecodyn were tested and one of each of the other two instruments; thus four reflectometers participated in the test. These instruments were denoted No. 1–4.

A test route of 19 edge lines and 2 lane lines was defined. All edge lines were continuous, plane or profiled, while the lane lines were plane, 3 metres long with a gap of 9 metres. At each test site a section of 200 metres was measured, twice with each instrument. As reference, a hand-held reflectometer of type LTL-2000 was used. At each test site, a number of 32–38 readings were taken with this instrument.



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