LTL-M mobile retroreflectometer for road markings

The modern, easy-to-use retroreflectometer

LTL-M, the DELTA mobile retroreflectometer for measuring night visibility (RL) 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, including night visibility RL, daylight contrast, marking width, road stud (RRPMs) presence, etc.

Full coverage at normal traffic speed – day or night

Retroreflectivity measurements can be acquired at normal traffic speed, and during day or night at the user’s preference, 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.

Camera based measurements ensure optimum match to LKA and LDWS systems

The LTL-M retroreflectometer employs modern camera technology rather than limited laser solutions. Using correct illuminant “A” light source guarantees adhering to the standards – and ensures optimum match to the conditions used in modern vehicles, e.g. lane keeping assistance systems, LKA , and lane departure warning systems, LDWS.

Fast to mount and calibrate retroreflectometer

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

Overhead camera, DMI and link to Google Earth

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.

Performance match to handheld retroreflective measurements

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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