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DELTA – a part of FORCE Technology Retroreflectometers for Road Traffic Safety

Delta Lead

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

Making sure your markings and signs are performing according to current standards helps to guide traffic safely, day and night, and reduce 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 first to launch a retroreflectometer and we have since continued to be deeply involved in forging the international standards on retroreflection measurements 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 patented technology combining a flash light system, fast digital camera technology and real-time digital image processing. The result is a measurement system delivering hitherto unparallelled 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 is very user-friendly when it comes to operating the instrument.

LTL-M measures the retroreflection of pavement markings continuously with a measurement width of 1m / 3.3ft. It can measure double lines simultaneously, reports individually and records the geometry of the markings. LTL-M in addition records the presence of raised pavement markers (RPM) also referred to as cat eyes or road studs.

LTL-X Mark II and LTL-XL retroreflectometers for pavement markings

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

If you need to measure retroreflection from high-profile markings or measure during continuous rain, the recently upgraded DELTA LTL-X Mark II is the answer.

Both instruments make use of LED technology, which makes the instrument almost maintenance-free. It allows you to work efficiently with measuring times of 1s to 3s and a large memory of more than 200,000 measurements. Calibration of the instruments is a one-step process taking less than one minute.

RetroSign GRX retroreflectometer for road traffic signs, high-visibility clothing, licence plates and reflective tapes

DELTA’s brand new RetroSign instrument is offered in three base models: GRX-1, GRX-3 & GRX-7, where the digit in the name tells the number of observation angles active. RetroSign GRX is the most advance instrument on the market currently and still very easy to operate.

It adds new features allowing users to undertake a more complete measurement programme on, for example road traffic signs. It offers automatic colour recognition, picture of sign, background and legend colour retroreflection and contrast, scanning of barcodes and QR codes for asset management, a US sign library and much more.

RetroSign GRX is scalable. The instrument may be purchased as a base model and can later easily be upgraded with additional features by simply scanning a barcode sent by DELTA.

GRX can be delivered with an app for transfer of data to a tablet and the option to instantly send date to the company back-office for analysing and filing.

Marking Thickness Gauge and Road Marking Control Kit

If the quality of markings has to be checked, DELTA can deliver our Marking Thickness Gauge for measuring the thickness of the marking material and the Road Marking Control Kit for checking additional parameters related to markings.

Single-handed operation and single-touch retroreflectometers

DELTA’s instruments have been developed with the user in mind. The instruments 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 with USB or Wi-Fi interfaces for easy data transfer. Measurement data can in a single click be passed on to a spreadsheet for further processing and generation of graphics and with GPS-installed display measurement locations and results on Google Earth.

Calibration and international standards of retroreflectometers

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

DELTA’s instruments comply with internationally recognised standards, such as EN1436, ASTM E1710, ASTM E2177, ASTM E2302 (LTL-XL) and ASTM E2832 (LTL-X) for pavement markings, and EN 20471, EN 12899, ASTM E1709 and ASTM E2540 for traffic signs and high-visibility clothing.

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Press Release

DELTA to Attend Intertraffic 2018

DELTA will be at Intertraffic 2018 in Amsterdam, the Netherlands, to show and demonstrate our retroreflectometer instruments.

Product and Services
White Papers

Road markings: Choose the Right Type of Retroreflectometer

It's well known that the visibility of road markings is important for the traffic flow and road safety. The reflection properties giving the visibility of the road marking are measured using a retroreflectometer.

DELTA Light & Optics

Venlighedsvej 4

DK-2970 Hørsholm


+45 7219 4000 +45 7219 4630 (dir.) +45 7219 4001

DELTA – a part of FORCE Technology Images

Press Release

27 February 2018

DELTA will be at Intertraffic 2018 in Amsterdam, the Netherlands, to show and demonstrate our retroreflectometer instruments.

Read more
1 February 2017

More vehicles are finding their way on the roads worldwide. This increase in traffic puts extra focus on the need for making the roads safe for travellers. Safe traffic flow is highly dependent on properly performing road markings and traffic signs - something TAPCO, a large supplier of equipment related to traffic safety in North America, is highly aware of.

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22 September 2016

DELTA has launched the LTL-X Mark II for measuring nighttime visibility of pavement markings. LTL-X Mark II is replacing the well-known LTL-X, the most sold hand-held retroreflectometer in USA since its launch 13 years ago and widely used in other parts of the world.

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16 September 2016

DELTA is launching RetroSign GRX retroreflectometer for measuring road traffic signs and other high-reflecting traffic safety items.

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31 March 2016

DELTA will be exhibiting during Intertraffic Amsterdam. We will present our range of retroreflectometers, which consists of already known instruments like LTL-XL and the mobile LTL-M for markings, as well as our recent developments LTL-X Mark II for markings and RetroSign GRX for traffic signs.

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30 January 2015

Road markings are an often underestimated tool in traffic safety.

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15 January 2015

DELTA is the leading supplier of instruments for measuring retroreflection of pavement markings and traffic signs for roads and airfields. DELTA's handheld devices, RetroSign GR3, LTL-X and LTL-XL, are known worldwide for high reliability besides being easy and simple to calibrate and operate.

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5 October 2014

The quality and performance of pavement markings have increased in recent years thanks to better paint and thermoplast and higher performing glass beads.

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21 March 2012

In 2011, DELTA launched the LTL-M mobile retroreflectometer for measuring retroreflection of road markings.

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23 November 2011

Earlier this year DELTA launched the LTL-M mobile retroreflectometer for measuring retroreflection of road markings. Based on DELTA's patent pending digital geometry correction system, LTL-M is the first mobile retroreflectometer offering the same accuracy as known from handheld instruments.

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16 March 2011

Delta will be attending the 25th Traffex at the NEC, Birmingham with its range of retroreflectometer instruments. Delta has been the global leading supplier of retroreflectometers for pavement markings and traffic signs for the last four decades. Delta’s LTL and retrosign brands are kno

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Regional Offices

DELTA Light & Optics

Venlighedsvej 4

DK-2970 Hørsholm


+45 7219 4000 +45 7219 4630 (dir.) +45 7219 4001

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