DELTA - Retroreflectometers for Road Traffic Safety

DELTA provides a highly reliable range of retroreflectometers for measuring retroreflection from pavement markings and traffic signs.

Making sure your markings and signs are performing according to current standards help guide traffic safely, day and night, and reduces the number of accidents, injuries and fatalities on the road. Knowing the condition of your road assets allows road owners to make sensible decisions related to road maintenance.

Retroreflection measurement of pavement markings and traffic signs

Three decades ago DELTA was the first in the world to launch a retroreflectometer and, over the years, we have been deeply involved in writing the international standards on retroreflection measurement of pavement markings and traffic signs.

As a global leader in the supply of retroreflectometers, and the preferred choice of professionals, we invite you to use our instruments, knowledge and experience.

Continuous measurements of pavement markings

DELTA's LTL-M mobile retroreflectometer for measuring retroreflection of pavement markings is the latest model in our well-known LTL-range of instruments. LTL-M is built using a patent-pending technology based on high-speed pulsating light, fast digital camera technology and digital image processing. The result is a measurement system delivering hitherto unparalleled accurate measurements.

LTL-M is easy to mount on any type of standard vehicle, using fittings supplied with the system. It is easy to calibrate in a simple one-step process and easy to operate.

LTL-M measures the retroreflection of markings continuously in roads up to 1m wide, can measure double lines individually and records the geometry of the markings. LTL-M also records raised pavement markers (RPMs) and detects missing or non-working RPMs.

Retroreflectometers for pavement markings

At the end of 2008, DELTA launched its latest handheld model for measuring the retroreflection of pavement markings. LTL-XL measures night (Rl) and day (Qd) visibility of all types of dry and wet pavement markings.

LTL-XL uses LED technology, which makes the instrument almost maintenance-free. It also allows you to work efficiently with measuring times of 1s to 3s and a large memory of more than 200,000 measurements.

If you need to measure retroreflection from high-profile markings or measure during continuous rain, DELTA can offer the LTL-X.

Retroreflectometers for traffic signs

DELTA offers various models of RetroSign for measuring retroreflection of traffic signs. RetroSign GR3 offers the possibility to measure three observation angles simultaneously and three entrance angles using lens attachments. RetroSign measures all colours in one without adjustments. This allows GR3 to cover almost all market needs.

The RetroSign models can be fitted with RFID or barcode readers to allow electronic asset management.

Single-handed operation and single-touch retroreflectometers

DELTA's instruments have been developed with the user in mind. They come with single-handed operation and single-touch controls, which makes the operator work easily and simply. Our instruments are offered as a base model allowing the user to add features according to his or her needs and financial capacity.

DELTA's instruments come standard with USB interface for easy transfer of data to proprietary software supplied with the instruments. Measurement data can in one click be passed on to a spreadsheet for further processing and generation of graphics.

Calibration and international standards of retroreflectometers

DELTA's instruments are all easy to calibrate in a simple one-step process. The calibration units are calibrated in DELTA's DANAK accredited laboratory and are traceable to Physicalish-Technische Bundesanstalt, Germany and the National Institute of Standards and Technology, US.

DELTA's instruments comply with the internationally recognised standards EN1436 and ASTM E-1710 for pavement markings and EN 12899 and ASTM E-1709 for traffic signs.