The LTL-M mobile retroreflectometer features
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The LTL-M mobile retroreflectometer features The efficient and accurate way to measure the retroreflection of road markings LTL-M measures all types of road markings at a simulated distance of 30 m with the highest level of accuracy. LTL-M is used mounted on a vehicle measuring retroreflection at traffic speed, providing full overview of the condition of the road markings. The instrument operates with an accuracy of typically +/- 5 % and a repeatability of typically of +/- 3 %, which is in line with DELTA’s hand-held retroreflectometers LTL-2000, LTL-X Mark II, and LTL-XL. LTL-M is a robust, reliable and advanced instrument designed for professionals using modern digital camera and illumination technology and data presentation in real time. This technology results in high measurement accuracy independent of changes in the geometry of the system caused by vehicle bouncing during driving. LTL-M mounted on a vehicle The LTL-M system consists of three parts LTL-M measures RL (nighttime visibility) under dry conditions, daylight contrast as well as records line geometry and missing or non-working road studs (RRPMs). ·· The sensor unit mounted on the outsite of the vehicle contaning camera and flash system ·· The real time processor placed inside the vehicle ·· The GUI (Graphical User Interface) Tablet PC placed next to the driver LTL-M measures white and yellow road markings up to 25 mm/1 inch in profile depth with no adjustments necessary. Calibration and change of light source can be done with a simple operation in the field. LTL-M captures night visibility of road markings LTL-M is a mobile retroreflectometer which measures the visibility of the retroreflection of road markings at traffic speed and with the same accuracy as a handheld instrument. Flash Camera Vehicle fittings The retroreflectometer consists of a flash which illuminates in an angle of 2.29o and a camera which records in an angle of 1.24o. The illumination system projects a precise and demarcated field across the road marking and analyses areas where the field contains the road marking. The LTL-M system makes automatically a dynamic geometry compensation of movements in the vehicle. Display of a record by the camera Hut for reduction of sun and dirt LTL-M may be mounted on any kind of vehicle and measurements can be conducted safely – without closing the road. Facts about LTL-M The retroreflectometer system consists of three units, the sensor itself (camera, flash unit and GPS), the processor for realtime calculations and logging of data and a GUI (Graphical User Interface) for wireless operation of the system using a tablet PC. The LTL-M illuminates an area of 1 x 1 m / 3 x 3 feet The distance from the road surface to the sensor bottom edge: 10 cm / 4 inch LTL-M illustration from the Danish engineering magazine Ingeniøren 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. A DMI unit ensures correct distance measures if GPS contact cannot be established. 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. The system gives the driver the option of marking incidents during operation in the log as well as inform about possible problems and malfunctions. 1020.9.18

The LTL-M features in brief Video overlay The software supplied with the instrument generates an easy-toread txt.file and/or Excel file, a graph and a google earth map for measurement evaluation and presentation. LTL-M lends itself to remote service and easy software upgrades through internet link-up when new advanced road marking analysis is offered. The LTL-M calibration reference is calibrated at DELTA’s DANAKaccredited laboratory and is traceable to standards issued by PTB (Physikalish-Technische Bundesanstalt, Germany) and NIST (National Institute of Standards and Technology, USA). The...