The purpose of this document is to provide recommendations for the lighting of roundabouts. In the US Federal Highway Administration publication FHWA-RD-00-067, Roundabouts; An Informational Guide1 it states:

"For a roundabout to operate satisfactorily, a driver must be able to enter the roundabout, move through the circulating traffic, and separate from the circulating stream in a safe and efficient manner. To accomplish this, a driver must be able to perceive the general layout and operation of the intersection in time to make the appropriate maneuvers. Adequate lighting should therefore be provided at all roundabouts."

This document therefore defines light levels within the roundabout, and vertical light levels at locations where pedestrians are present. Other considerations are discussed including glare, light trespass, and pole placement to help achieve proper lighting and to better define the traffic elements within the roundabout.