Page 230 - TransportationPlanUsetsGuide

Americans with Disabilities Act (ADA) – Federal civil rights legislation enacted by Congress in 1990 that
mandates equal opportunity for people with disabilities in employment, transportation, public accommo-
dation, public services and telecommunications. Transportation implications of ADA include the design of
sidewalks and curb cuts, accommodation of mobility devices on transit vehicles, provision of door-to-door
paratransit service, and availability of parking spaces for the disabled.

Arterial – A functional class of roadways intended to provide general mobility for travel within the region.
Correctly sized Arterials at appropriate intervals allow through trips to remain on the Arterial system thereby
discouraging use of Local Streets for cut-through traffic. Arterials link major commercial, residential, indus-
trial and institutional areas.

Average daily traffic (ADT) – The number of motor vehicles that pass through a particular point on a roadway
during an average day. ADT is a relatively generic term that may refer to one of several federally-defined traf-
fic volume indicators, including annual average daily traffic (AADT) and annual average weekday daily traffic
(AAWDT). Because a true 365-day, 24-hour counting process is not practical in most cases, ADT is typically
sampled over the course of one or more days and repeated annually.

Bicycle – A vehicle having two tandem wheels (a minimum of 14 inches in diameter) propelled solely by hu-
man power, upon which a person or persons may ride. A three-wheeled adult tricycle is considered a bicycle.
ADOPTED TEXT Bicycle facility – A general term denoting improvements and provisions made to accommodate or encour-
In Oregon, a bicycle is legally defined as a vehicle. Bicyclists have the same right to the roadways and must
obey the same traffic laws as the operators of other vehicles.

age bicycling, including on-street bikeways, multi-use trails, bicycle parking facilities, and devices that allow
bicycles to brought on transit vehicles.

Bike lane – A portion of a roadway that has been designated by striping, signing and pavement markings for
the use of people riding bicycles. The Washington County Road Design and Construction Standards call for
six-foot-wide bike lanes, though exceptions may be granted by the County Engineer for five- or four-foot-wide
bike lanes in cases of constricted right-of-way.

Bikeway – A bikeway exists on any road that has the appropriate design treatment to accommodate bicy-
clists based on motor vehicle traffic volumes and speed. The basic design treatments used for bicycle travel
on roads are shared roadways, shoulder bikeways and bike lanes. Enhanced versions of bikeways on roads
include buffered bike lanes, cycle tracks and neighborhood bikeways (also called neighborhood greenways or
bike boulevards). Off-street shared-use paths (also called multi-use trails) are also a type of bikeway.

County Board of Commissioners (BCC or Board) – The governing body of Washington County, Oregon,
consisting of five elected members, including four district representatives and an at-large chair. Washington
County has a council-manager form of government, giving the Board legislative responsibility and designat-
ing administrative authority to a Board-appointed professional county administrator. The commissioners also
serve as the governing board for Clean Water Services, a public utility providing wastewater, stormwater and
other services.

Buffered Bike Lane – A bike lane that is further separated from automobile traffic by a two- to three-foot wide
painted buffer, typically with diagonal hatching. Buffered bike lanes may be appropriate on roadways with
10,000 or more average daily vehicles and speeds of 25 mph or greater.

210 APPENDICES
Effective November 27, 2015 • Updated December, 15 2016