RoadVista Laserlux Retroreflectometer vs Retrotek Retroreflectometer
Comparing the RoadVista Laserlux Retroreflectometer to the RetroTek Retroreflectometer
There are new developments in vehicle technologies that will have a major impact on the road marking industry. The development of Advanced Driver Assistance Systems (ADAS) is likely to increase pressure on Road Authorities to improve the quality and consistency of road markings to support safety systems such as Lane Departure Warning. It is predicted that 73% of all new cars will include some form of ADAS by 2023. These advances in driving technology is encouraging a more standardised approach to uniform road markings internationally, in order for ADAS enabled vehicles to function efficiently globally.
Laserlux G7 Retroreflectometer
Front Mounted Retroreflectometer vs Side Mounted
The Laserlux G7 unit attaches to the side of the survey vehicle using suction cups secured with safety straps. There are noteworthy risk factors associated with mobile systems that rely on suction cups and strapping for use. The surveying vehicle must stop regularly in order for operators to check that the unit is still secure and maintains correct 30m geometry. Another negative to this side mounted unit is that it represents an increased risk to passing traffic being a non-uniform protrusion from the vehicle. The Laserlux G7 system measures at a distance of 6m ahead of the sensors.
Retrotek breaks the mould with its front mounted design. The RetroTek-D is mounted using the standard front square tow hitch on the survey vehicle, so no special modifications are required. Due to the fixed nature of this unit, there are none of the safety or vibration issues associated with competitor units that rely on suction cups or straps. It does not protrude from the side of the vehicle to endanger other road users. The RetroTek-D enclosure has ~ 8”+ (200mm) ground clearance while carrying out a survey, double the clearance of dynamic side mounted systems ensuring sufficient clearance for kerbs, parking stops, speed ramps etc. When not operational, it can be raised higher to provide even further protection. The RetroTek-D retroreflectivity conforms to 30m geometry & takes measurements at a distance of 12m ahead of the sensors.
Laser-diodes and Overhead Camera
The Laserlux G7 uses the traditional laser-diode based system, scanning markings over 400 times per second. This system uses an overhead camera, mounted on the inside of the windscreen, in order to capture video to support the survey reporting. The issue with using an overhead camera is that it doesn’t capture the same view that the retroreflectometer is seeing, which can lead to difficulties visibly identifying the cause of road markings failing to meet requirements.
LED Projector system and Integrated Camera
The RetroTek-D uses reliable, long-life LED projectors rather than lasers when taking measurements. It also uses an integrated camera, located within the front mounted unit. The video footage captured by this HD camera is used to support the survey report. With the camera being mounted at the correct geometry much closer to the road than with an overhead camera, images obtained give a much more accurate representation of the reflective condition of the road markings.