A raised pavement road stud is a safety device used on roads. These raised pavement road stud devices are usually made with plastic, ceramic, thermoplastic paint, glass or occasionally metal, and come in a variety of shapes and colors.
The raised pavement road stud, such as plastic, ceramic, metal ones, include a lens or sheeting that enhances their visibility by retro-reflecting automotive headlights, while glass road studs gather automotive headlights with a dome shape and reflect the lights with a reflective layer within.
The raised pavement road stud provides highly effective visibility even at night or during rain. Yellow raised pavement markers can be easily fixed to asphalt pavements with a strong adhesive.
Different color of raised pavement road stud express different meanings. White studs mark the lanes or the middle of the road. Red road studs mark the left edge of the road. Amber road studs mark the central reservation of a dual carriageway or motorway. Green road studs mark the edge of the main carriageway at lay-by and slip roads. Green/yellow road studs indicate temporary adjustments to lane layouts, e.g., where road works are taking place.
Other countries have different types of reflective road studs. For example, New Zealand has raised road studs that don’t retract into the ground on motorways.
