Full coverage at normal traffic speed

LTL-M, the DELTA mobile retroreflectometer for measuring night visibility of pavement markings at traffic speed, is a new generation of mobile systems – and has already achieved a significant market penetration. The system solution outperforms other similar systems by offering better and more sophisticated solutions to mobile retroreflective measurements. Measurements can be acquired at normal traffic speed, hence avoiding dangerous incidents, where an operator must make handheld measurements in a busy road. Over 3,000 kilometers of road can be measured in a normal working week.

A viewing field of 1×1 m2 makes it easy for a driver to cover a line.

High performance of even difficult targets

Employing advanced camera-based techniques and real-time digital image processing ensure accurate measurement results under all driving conditions. Embedded features such as compensation of vehicle bouncing, vertical lifting, tilting, as well as handling of difficult measurement conditions for e.g. very curved roads, large variations in stripe profile height, etc. have positioned LTL-M at top in mobile systems and certainly ahead of the first generation of systems as seen from other suppliers – employing modern camera technology rather than limited laser solutions.

In addition to night visibility (RL), daylight contrast, marking width, road stud (RRPMs) presence, etc. are covered during a measurement.

Fast to mount and calibrate

LTL-M comes with GPS and can be delivered with DMI (Distance Measuring Instrument) and an overhead camera. GPS makes it possible to determine exactly where specific measurements have been carried out. An overhead camera supports additional visual inspection of problem areas when data are reviewed. Measurement data, GPS data and other recorded data will be automatically stored. Data can be linked to Google Earth.

Mounting and calibration of LTL-M can be done in 15 minutes, no other adjust-ments or control measures required.

The system performance is high, offering a repeatability of typically +/-3% and a reproducibility of +/-5%, when compared to handheld, static measurements.

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