The purpose of this chapter of the Warrenton Development Code is to implement Section 660-012-0045(2)(e) of the State Transportation Planning Rule that requires the City to adopt a process to apply conditions to development proposals in order to minimize impacts and protect transportation facilities (see Section
16.256.060). This chapter establishes the standards for when a proposal must be reviewed for potential traffic impacts; when a traffic impact study must be submitted with a development application in order to determine whether conditions are needed to minimize impacts to and protect transportation facilities; what must be in a traffic impact study; and who is qualified to prepare the study.
(Ord. 1225 § 13, 2019)
Average daily vehicle trips shall be calculated using the rates
and methodology in the most recent addition of the Institute of Transportation
Engineers Trip Generation Manual.
(Ord. 1225 § 13, 2019)
A traffic impact study will be required to be submitted to the
City with a land use application, when the following conditions apply:
A. The
development application involves a change in zoning or a plan amendment
designation; or,
B. The
development shall cause one or more of the following effects, which
can be determined by field counts, site observation, traffic impact
analysis or study, field measurements, crash history, Institute of
Transportation Engineers Trip Generation Manual; and information and
studies provided by the local reviewing jurisdiction and/or ODOT:
1. An increase in site traffic volume generation by 300 average daily
trips (ADT) or more; or
2. An increase in ADT hour volume of a particular movement to and from
the state highway by 20% or more; or
3. An increase in use of adjacent streets by vehicles exceeding the
20,000 pound gross vehicle weights by 10 vehicles or more per day;
or
4. The location of the access driveway does not meet minimum sight distance
requirements, or is located where vehicles entering or leaving the
property are restricted, or such vehicles queue or hesitate on the
state highway, creating a safety hazard; or
5. A change in internal traffic patterns that may cause safety problems,
such as back up onto the highway or traffic crashes in the approach
area.
(Ord. 1225 § 13, 2019)
The traffic impact study report shall be reviewed according
to the following criteria:
A. The
study complies with the content requirements set forth by the City
and/or other road authorities as appropriate;
B. The
study demonstrates that adequate transportation facilities exist to
serve the proposed land use action or identifies mitigation measures
that resolve identified traffic safety problems in a manner that is
satisfactory to the road authority;
C. For
affected City facilities, the study demonstrates that the project
meets mobility and other applicable performance standards established
in the adopted transportation system plan, and includes identification
of multi-modal solutions used to meet these standards, as needed;
and
D. Proposed
design and construction of transportation improvements are in accordance
with the design standards and the access spacing standards specified
in the transportation system plan.
(Ord. 1225 § 13, 2019)