Street Design Manual

Section 7.1.3 Criteria requiring Traffic Studies Traffic studies are required for development projects based on four criteria, outlined here. A. Land Uses: Traffic impact analyses shall be required for the following land uses a. Single Family Residential Developments ≥ 150 Dwellings b. Apartment Developments ≥ 240 Dwellings c. Residential Condo/Townhome Developments ≥ 300 Dwellings

d. General Office Buildings ≥ 64,000 sq.ft. e. Medical Office Buildings ≥ 47,000 sq.ft. f. Shopping Centers ≥ 23,000 sq.ft. g. Supermarkets ≥ 20,000 sq.ft. h. Convenience Market w/ Gas Pumps: 6 or more Fueling Positions* i. Pharmacy w/ Drive-Thru ≥ 29,000 sq.ft. j. Drive-In Bank ≥ 11,500 sq.ft. k. Fast-Food Restaurant w/ Drive-Thru ≥ 6,000 sq.ft

* Fueling positions are defined as the maximum number of vehicles that can be fueled simultaneously.

Guidance: The land use sizes listed in Section 7.1.3.A are consistent with the estimated volume of new trips on the public street system in Section 7.1.3.B after deduction for pass-by trips.

B. Trip Generation: Traffic impact analyses shall be required for the following trip generation volumes: a. Peak Hour Trips ≥ 150 veh/hour b. Peak Hour Trips ≥ 100 veh/hour if primary access is on a 2-lane road c. More than 100 veh/hour trips in the peak direction d. Daily Trips ≥ 3,000 veh/day e. Enrollment increases at public or private schools

Guidance: The volumes listed in Section 7.1.3 B are for new trips on the public street system after deductions for pass-by trips and for mixed-use developments, internal capture trips.

C. Site Context: Traffic impact analyses shall be required when the following conditions exist in the vicinity of the development site: a. Affects a location with a high crash history [Severity Index ≥ 8.4 or a fatal crash within the past three years] b. Takes place at a highly congested location [volume-to-capacity ratio ≥ 1.0 on both major street approaches] c. Creates a fourth leg at an existing signalized intersection d. Exacerbates an already difficult situation such as a RR Crossing, Fire Station Access, School Access, etc.

Raleigh Street Design Manual Page 45