Oregon Administrative Rules › Chapter 734 - DEPARTMENT OF TRANSPORTATION, HIGHWAY DIVISION › Division 20 - TRAFFIC CONTROL › Section 734-020-0014 - Speed Zone Definitions

Current through Register Vol. 63, No. 7, July 1, 2024
The following definitions apply to OAR 734-020-0013  through
				734-020-0018.
(1) "Average crash rate"
			 means the average of the crash rates for a group of similar highway segments
			 within the same functional class and the same geographical area (either
			 countywide or statewide).
(2)
			 "Average daily traffic" means the total number of vehicles to operate over a
			 designated segment of highway during a given time period greater than one day
			 and less than one year, divided by the number of whole days in that time
			 period.
(3) "Business district" has
			 the meaning defined in ORS
			 801.170.
(4) "City limits" means the limits of an
			 incorporated city.
(5) "Computed
			 eighty-fifth percentile speed" means the eighty-fifth percentile speed minus
			 the difference between the crash rate and the average crash rate (if the crash
			 rate is above the average crash rate for the same functional classification
			 highways within the road authority's jurisdiction), with maximum possible
			 deduction of 5mph. If there is no average crash rate available for the highway,
			 then the computed eighty-fifth percentile speed is the eighty-fifth percentile
			 speed.
(6) "Context" means the
			 roadway characteristics and land uses accessible by parking or driveway along
			 the highway segment, determined based on the existing land use types, building
			 density, set back of buildings and numbers and types of users of the
			 transportation system accessible along the roadway segment. In descending order
			 of density, the four urban contexts are:
(a)
			 "Urban Core," which generally includes downtown areas with the highest
			 development densities and building heights in the urban area, minimal setbacks
			 (building in back of sidewalk), parking on the street within a well-connected
			 roadway system and typically smaller consistent block sizes.
(b) "Urban Mix," which generally includes
			 mixed -use (commercial, retail, restaurant, office and residential) high
			 density areas on small lots with buildings typically adjacent to the sidewalk
			 and parking on the streets, where buildings are typically not as tall as urban
			 core and may have parking in front or behind the buildings within a
			 well-connected roadway system and typically small to medium block
			 sizes.
(c) "Suburban Commercial or
			 Residential," which generally includes areas of land uses that have
			 residential, offices, restaurants or retail spaces with setbacks from the
			 roadway usually meant to be more accessible by car and may include large
			 parking lots, or which may be characterized by big box stores, commercial strip
			 centers, auto dealers, office parks or gas stations, or which may be large
			 residential neighborhoods along the corridor or that have their access from
			 widely spaced roadway connections with few driveways to the roadway
(d) "Suburban Fringe," which generally
			 includes transition areas between urban and rural areas where there may be few
			 homes and structures, sparsely developed land, lower density of businesses and
			 fewer driveways, intermittent commercial or industrial uses and typically have
			 fewer street connections and larger lot sizes.