2. PUDs
3. Other development applications that are likely to have neighborhood or community-wide
impacts (e.g., traffic, parking, noise, or similar impacts), as determined by the Planning
Director.
17.20.060 Traffic Impact Analysis
A. Purpose. The purpose of this section of the 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 protect and minimize adverse impacts to transportation facilities.
This section establishes the standards for when a proposal must be reviewed for potential traffic
impacts; when a Traffic Impact Analysis (TIA) must be submitted with an application in order to
determine whether conditions are needed to minimize impacts to and protect transportation facilities;
what must be in a TIA; and who is qualified to prepare the analysis.
B. Typical Average Daily Trips and Peak Hour Trips. The latest edition of the Trip Generation
manual, published by the Institute of Transportation Engineers (ITE) shall be used as standards by
which to gauge average daily and peak hour (weekday and/or weekend) vehicle trips, unless a
specific trip generation study that is approved by the City Engineer indicates an alternative trip
generation rate is appropriate. A trip generation study may be used to determine trip generation for a
specific land use which is not well represented in the ITE Trip Generation Manual and for which a
similar facility is available to count.
C. Applicability and Consultation. A Traffic Impact Analysis shall be required to be submitted to the
city with a land use application when (1) a change in zoning or plan amendment is proposed or (2) a
proposed development shall cause one or more of the following effects, which can be determined by
field counts, site observation, traffic impact analysis, field measurements, crash history, Institute of
Transportation Engineers Trip Generation; and information and studies provided by the local
reviewing jurisdiction and/or ODOT:
a. The proposed action is estimated to generate 250 Average Daily Trips (ADT) or more, or 25 or
more weekday AM or PM peak hour trips (or as required by the City Engineer);
b. An increase in use of adjacent streets by vehicles exceeding the 20,000 pound gross vehicle
weights by 10 vehicles or more per day
c. The location of the access driveway does not meet minimum intersection sight distance
requirements, or is located where vehicles entering or leaving the property are restricted, or such
vehicles queue or hesitate, creating a safety hazard; or
d. The location of the access driveway does not meet the access spacing standard of the roadway on
which the driveway is located; or
e. A change in internal traffic patterns that may cause safety problems, such as back up onto public
streets or traffic crashes in the approach area.
The applicant shall consult with the City Engineer or his/her designee at the time of a pre-application
conference (see Section 17.09.120 Pre-Application Conferences) about whether a TIA is required
and, if required, the details of what must be included in the TIA.
D. Traffic Assessment Letter. If a TIA is not required as determined by Section 17.20.060.C, the
applicant shall submit a Transportation Assessment Letter (TAL) to the City indicating that TIA
requirements do not apply to the proposed action. This letter shall present the trip generation
estimates and distribution assumptions for the proposed action and verify that driveways and
roadways accessing the site meet the sight distance, spacing, and roadway design standards of the
agency with jurisdiction of those roadways. Other information or analysis may be required as
determined by the City Engineer. The TAL shall be prepared by an Oregon Registered Professional
Engineer who is qualified to perform traffic engineering analysis.