Reflect Visible Light and Infrared Light Markings
May 27, 2020

Reflect Visible Light and Infrared Light Markings

Currently the road markings in the world are almost based on the reflection of visible light. These markings can be easily identified by video analysis and other methods in automatic driving. But when in rainy, snowy and icy days, these identifications become blind areas.

In order to identify the road markings better without blind areas. It becomes true to have the infrared reflection function in road marking, under the premise of having visible light.

Traffic signs and markings which adapt to automatic driving road should be cleaned and maintained frequently to ensure the visibility. The signs and markings should avoid to be blocked by trees and be affected by road light.

Digital traffic signs and markings adapted to automatic driving road can be divided into two types base on their number. The two types’ classification as below sheet

Classification of digital signs and markings




One facility is only used to convey individual traffic signs and marking information.


Within a certain road section, one facility conveys multiple traffic signs and marking information

Reflect Infrared Light Glass Beads

In 2016, reflect infrared light glass beads have been used on the monitoring of vehicles exhaust. Following the increase of vehicles and the policy of vehicles’ annual survey every six years, it makes monitor the vehicles real-time on the road with remote sensing method more important.

Moreover, the newly issued “Atmospheric” in 2015 clearly stipulates that real-time telemeter can be used without affecting the driving of vehicles on the road. Tradition vehicles exhaust telemeter just can detect one car every time. If there are two cars pass through the telemeter at the same time or overlap, it is impossible to identify which ones’, and the detection data is invalid.

And tradition vehicle exhaust telemeters use mirror emission to emit light. When use gantry-type to fix the telemeter, the way of installing plane reflectors on the ground is basically inadvisable.

At present, the measurement of the concentration of the main pollutant vehicles exhaust uses the principal of retro-reflection. There are two methods of tradition retro-reflection: the first one is optical angle reflector which has good retro-reflective function, but is expensive and requires high processing accuracy. Its reflective angle is almost 0 degree and the angle of incidence is also around 0 degrees which limit its application in many fields. The second one is glass microbeads retro-reflective materials which are mostly used for road marking lines. Its life span is generally only about 3 months, and the wavelength is limited to the visible light range. For example, the patent publication No.CN104461169A provides an infrared return, but the reflection film wavelength can only reach 940mm.

automatic driving

self driving

Reflect Visible Light and Infrared Light Markings

infrared reflection in road marking

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