Caltrans began phasing in retroreflective signage in 1999. The image on the left shows an old sign with retroreflective overlay sheets. Dots needing illumination from electric lights shining on ...

Liquid-based retroreflective coatings are commonly used to increase visibility of pavement markings and street signs. PPG’s Envirocron LUM coating is the first ever retroreflective powder ...

Our approach also supports retroreflective materials through a minor modification of the image formation model. The most remarkable property of equation (1) is the fact that a change of variables ...

However, there are times when neither sensor will work. Fortunately, a third option does exist: the retroreflective ultrasonic sensor. Traditional ultrasonic sensor designs determine sensor-to ...