A thin film that reflects light in intriguing ways could be used to make road signs that shine brightly and change color at night, according to a study that will be published on Aug. 9 in Science ...

The U.S. Department of Transportation’s Federal Highway Administration (FHWA) today announced a final rule that will improve safety for all road users by ensuring that pavement markings are made more ...

Once the sun sets, commuting by bike or skateboard becomes a risky game. The newest gear for night riders is a stylish shirt with retroreflective stripes sewn directly into the fabric, increasing ...

High-visibility vests, also known as hi-vis or reflective vests, are designed to offer a measure of protection during daytime, nighttime and other low-light conditions for workers in various ...

Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit NAP.edu/10766 to get more information about this ...

The usual way of detecting objects of varying shapes, heights, or positions has been through the use of an array of single-beam photoelectric sensors or a thru-beam light grid: a photoelectric array ...