If there was an all-star team of global positioning system (GPS) devices, reflector tacks would be in the starting lineup. They're the fingernail-size thumbtacks covered with reflective sticky-dots.

D scanners rely on being able to identify physical features of an object, and line up what it saw a moment ago with what it ...

What’s That Thing is Slate’s column examining mysterious or overlooked objects in our visual landscape. To submit suggestions and pics for future columns, send a description or a pic to ...

More than 1.3 million safety devices installed across the state -- the small reflectors which illuminate the road in the dark and when it rains -- are designed to keep motorists safe, but some of them ...

It wasn't that long ago, especially in the Midwest, that rare was the highway that relied on raised pavement markers to improve safety. But as research showed the impact raised markers can have on ...