EN
Advances in Retroreflective Technology to Improve Road Safety
Retroreflective technology increases the visibility range of drivers in low-light situations.
Retroreflective technology enhances, and protects, the driver’s ability to see important road infrastructure in advance, and even in low- or un- lit road conditions, or where sight distance limited by human vision (or even technology). Diffuse reflection reduces brightness, where retroreflective materials preserve distance brightness. Retroreflective materials enable reflective road signs, and pavement road markings, to be recognized at up to 8 times the distance versus the non-retroreflective alternatives. Retroreflective road signs and markings allows the visually unprotected drivers to detect those hazardous road infrastructure and markings safely, and far away, to the distance of 500ft (where un-retroreflective road signs and markings would only safely and un-hazardously allow that road infrastructure and markings to be detected at 100 ft).
Studies of luminance signs and driver performance (FHWA & IIHS).
The FHWA confirmed that an optimally luminance complying facility improved driver highway performance: It allowed a decremented road sign, reflection, and brightness, “properly maintenanced reflector” to ”decrease brake reaction time” to a highway and speed (or 60 miles and hour) of one-and-a-half seconds, and that time made the difference of an unsafe versus a safe stop time and distance to not cause a highway or road accident collision, and that time. In a (400) highway segment IIHS analysis where upgraded reflector-compliant facilities occurred and luminance standards were met: a 37% improvement in night time highway or road accident collision reduction occurred. These resulted in time and in a faster decision speed of a roadway reflector where retroreflective road markings and signage were of a high contrast, standards. Faded signed road markings were not compliant reflective and road signage, and resulted in a safe unobstructive decrement of 0.8 seconds decision time and reduced accident incident crashes.
Regulatory Standards and Compliance for Reflective Road Facilities
Reflective road facilities are positioned and built so that they are visible during the day and night and are designed to last, with proper engineering, for many years in the constantly changing weather conditions. Adhering to the MUTCD, ANSI/ASTM specifications, and European standards guarantees that the facilities meet the minimum standards for road sign retroreflectivity, luminance levels for the safe and proper visibility of road markings, and the weathering and abrasion resistance of road marking materials, which assists in determining safe, long-term visibility during the night.
The standards that must be observed are the MUTCD, ANSI/ASTM, and European standards concerning road signs and road markings.
The MUTCD establishes the minimum retroreflective standards for signs of a particular classification and speed. The ANSI/ASTM standards set the minimum standards for measuring the beads in the reflective road marking materials and the measurement of the light used to view the road markings. The European standards, as an example, set the view angle and the range of colors the road markings and/or signs must possess to ensure good visibility at different headlights and/or varying viewing conditions. If any of the standards are not met, the road sign visibility is compromised, and the road's liability increases, making it important for municipalities and contractors to obtain third-party certifications that prove the road control devices are made with quality materials.
The state Departments of Transportation (DOT) audits (enforcement impact) about improved compliance and safety results during the years 2020–2023.
The ability to demonstrate compliance with the safety and engineering regulatory standards as a result of audits has resulted in actual road safety improvements. For example, California is one of the states that has demonstrated a 42% decrease in non-compliant road control devices and a 37% decrease in nighttime road accidents in rural areas of the state (NHTSA 2022) as a result of implementing the required reflective testing. Ohio's compliance with road marking has also resulted in a positive impact, as it demonstrated a 29% reduction in lane departure crashes during the years 2020–2023. These are clear examples of the benefits from applying these standards as they demonstrate a positive impact on improving road safety and a reduction in the severity and number of accidents.
The guaranteed advantages of reflective road materials
The average crash reduction is 37% of nighttime rural intersection crashes. (NHTSA, 2022)
Retroreflective signs, patterns, and materials improve safety and extend visual recognition distances (giving drivers 2-3 additional seconds to predict and avoid a crash) and reduce the risks of low and no light conditions. The effectiveness of retroreflective markings is mitigated by low-light conditions. Refers to NHTSA data 2022, an average of 37% reduction in rural intersection nighttime crashes after implementing reflective signs and markings.
Protection of vulnerable users: Pedestrians, cyclists, reflective road materials, and road construction/maintenance workers.
V We have specially designed glare reflective reflective materials that help mitigate the inequitable high nighttime risks face by these users (when there is little or no street illumination and when the vehicle speed is high, the driver's reaction time becomes unoperated).
- Prismatic reflective delineation of a pedestrian crossing increases the detection of the pedestrian by more than 150 ft
- Retroreflective tapes in construction zones reduce the incident of workers being hit by vehicles by 44%, according to a study by the U.S. Department of Defense
- Engineered sheeting increases the conspicuity of cyclists in the pavement markings of a horizontal curve in a bicycle lane.
These materials create the absence of horizontal curve lighting and minimum light conditions, creating a minimum life-saving distance for road users other than vehicles, and turning passive road infrastructure into active life-saving protective measures.
FAQ Section
What is retro-reflective technology?
Retro-reflective technology is a material that reflects light at the same angle at which light (for example, vehicle headlights) is coming from, thus improving its visibility in poor light conditions.
What standards govern reflective road facilities?
The visibility and performance requirements for reflective road facilities are covered by standards like the Manual on Uniform Traffic Control Devices (MUTCD), ANSI/ASTM specs, and the EN standards.
How do reflective road facilities improve safety?
By improving visibility, reflective road facilities help reduce the chances of an accident by improving a driver’s reaction time.
How does enforcement improve compliance with standards?
States like California and Ohio where audits and tests are conducted routinely show compliance with the standards and demonstrate considerable improvements in safety.