Glossary terms

Raised Pavement Markers
Traffic control devices, usually retroreflective, embedded in the pavement and meant to delineate lanes in addition to striping.
Ramp Metering
The procedures used to reduce congestion by managing vehicle flow from local-access on-ramps using a traffic signal at the entrance ramp that allows vehicles to enter the freeway at predetermined intervals.
Dutch ministry of transports and water management.
Rotating Sign
Sign that can show two or more messages by rotation of the panel is composed of.