small pieces of glass or plastic that are put along the middle and sometimes the sides of a road, to reflect the lights of a car, in order to show the driver where to drive when it is dark

The state just put new reflectors along the highway.

Reflectors have to be extremely tough to withstand vehicles repeatedly driving over them.

A lane was closed where they were replacing the reflectors.

Reflectors are a relatively low-cost way of improving traffic safety.

So many nighttime accidents have happened at this curve that the police have added reflectors on the guardrails and the road for a half-mile ahead of the turn.