Page 41 - TransportationPlanUsetsGuide

Regional Mobility Standards
Metro identifies mobility targets in the 2014 RTP and the RTFP. The targets define deficiency thresholds for the mid-day
peak (highest 60-minute period between 9:00 AM and 3:00 PM) and the highest overall two consecutive hours of week-
day traffic volumes. The RTP mobility policies define an operating standard for different land use types within the Urban
Growth Boundary. Although these standards are labeled “interim,” they apply to the Washington County TSP until Metro
issues a revision to these policies. The two-hour peak standards are identical to those identified within the Portland
metropolitan region by ODOT in the Oregon Highway Plan. Washington County mobility standards are consistent with
Metro and ODOT requirements.

Washington County Mobility Standards
Washington County maintains a “Level
of Service” standard for vehicle opera-
tions on County roads as shown in Table
3.1. This standard is currently defined in
“Objective 5.3: Utilize the Interim Wash-
ington County Motor Vehicle Performance
Measures to manage congestion.” Por-
tions of Washington County are outside
of the Urban Growth Boundary. In these
areas the ODOT mobility targets identified
for rural highways apply. The County must
use the ODOT mobility targets when evalu-
ating congestion on ODOT facilities within
Washington County over the 20-year plan-
ning horizon of the transportation system
plan, or must adopt alternative mobility
standards that better reflect the goals in
the County’s transportation system plan.

Certain segments of statewide, regional,
or district highways may be designated as
Special Transportation Areas (STA), which
are areas of compact development located
adjacent to a state highway where the
need for appropriate local access out-
weighs considerations of highway mobility.
STAs are therefore subject to alternative
mobility targets. There are three STAs
within Washington County: Hall Boulevard Near Oak Street
• OR 8 (Tualatin Valley Highway) from milepost 16.06 to 16.67 in Cornelius.

• OR 47 (Tualatin Valley Highway) from milepost 25.34 to 26.54 in Gaston; and
• OR 141 (Hall Boulevard) from milepost 2.84 to 3.84 in Beaverton, unincorporated Washington County
and Tigard.

PART 3: TRANSPORTATION MODAL ELEMENTS 31
Effective November 27, 2015 • Updated December, 15 2016