Published on February 6, 2014
ENGINEERING ENGLISH Transportation and highways vocabulary Roads
Functional Classification • Categorizing roads based on the type of service provided: • freeway/expressway, • major arterial, • minor arterial, • collector, • connector or local road. • Examples?
Freeway/Expressway • A highway that serves inter-regional and intra- regional trips, and carries heavy volumes of traffic at high speeds. Examples: I-205; the Milwaukie Expressway (Oregon Highway 224)
Major Arterial • A road that primarily carries local and through traffic to and from destinations outside local communities; connects cities and rural centers, and carries moderate-toheavy volumes of traffic at moderate-tohigh speeds.
Minor Arterial • A road that primarily connects collectors to higher order roadways, and carries moderate volumes of traffic at moderate speeds.
Collector • A road that is a principal carrier within neighborhoods or single land use areas. Collectors link neighborhoods with major activity centers, other neighborhoods and arterials and are generally not for through traffic. They carry low-to-moderate volumes of traffic at low-to-moderate speeds. New collectors should intersect minor arterials rather than major arterials.
Public Roads • Roads owned by the County or on a County easement that are not maintained by the County; maintenance responsibility lies with abutting property owners.
Private Roads • Roads owned by a private property owner. Public access and use is by permission of the property owner.
City Streets • Similar to County roads, except under the jurisdiction of a city.
Local • A road designed to provide access to abutting property and to connect to higher order roads. New local roads should intersect connectors, collectors or, if necessary, minor arterials. Traffic calming measures may be appropriate. Local roads are inappropriate for through traffic.
Alley • An alley provides access to the rear of properties and may be public or private. Alleys should intersect local roads or connectors. Alleys are not for through traffic.
Jurisdictional Classifications • A classification of roads based on ownership of the road.
Interstate Highways • Multi-lane federal highway that provides connections to major cities, regions of the state and other states. Interstate highways are major freight routes. Maintenance responsibilities belong to the Oregon Department of Transportation.
State Highways • State-owned roads that provide the primary connections to larger urban areas, ports and major recreational areas that are not directly served by interstate highways. Maintenance responsibilities belong to the Oregon Department of Transportation.
County Roads • Public roads for which the Clackamas County Board of Commissioners has accepted maintenance responsibility.
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