Modern options for traffic signals include flashing lights, such as LEDs and Rectangular Rapid Flashing Beacons, and Internet of Things based systems.

Warning signs on the road are placed carefully and strategically in order to maximize their effectiveness for safety to drivers.

The most important factors for sign visibility, according to the International Sign Association, are size, angle, location, luminance, and contrast.  

Pool signs serve multiple purposes and have safety requirements, as they not only inform and warn swimmers, they protect property owners from lawsuits.