Glossary of Key Terms

Rectangular Rapid Flashing Beacon (RRFB)

User-prompted amber lights that supplement warning signs at unsignalized intersections or mid-block crosswalks. They can be activated by pedestrians manually by a push button or passively by a pedestrian detection system.

Pedestrian Hybrid Beacon (PHB)

Pedestrian-activated traffic control beacon that, when pushed, displays a sequence of flashing and solid lights that allows pedestrians to cross safely and indicates when it is safe for drivers to proceed. A solid red light requires drivers to stop while pedestrians have the right-of-way to cross the street.

Traffic Communications Corridor (TCC)

Coordinated signal timing in a major transportation corridor to transfer signal information between field controllers and a traffic management center (TMC).


Visual elements of a street, including the road, adjoining buildings, sidewalks, street furniture, trees and open spaces, that combine to form the street's character.

Shared Lane Markings

Also known as “sharrows,” these road markings are used to indicate a shared lane environment for bicycles and automobiles. Among other benefits, shared lane markings reinforce the legitimacy of bicycle traffic on the street and recommend proper bicyclist positioning.

Shared-use Path

A form of infrastructure that supports multiple recreation and transportation opportunities, such as walking, bicycling, inline skating and wheelchair mobility. A shared-use path typically has a surface that is asphalt, concrete or firmly packed crushed aggregate.

Shared Lane Green Infrastructure

An approach to managing stormwater, the urban heat island effect, health, and air quality based on ecosystem network models with interconnected plant, recreation and transportation amenities that improve public health.