R-762-11-86RESOLUTION NO. 762-11-86 (R)
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF ALLEN,
COLLIN COUNTY, TEXAS, ADOPTING AS POLICY CERTAIN
TRAFFIC MANAGEMENT STANDARDS.
WHEREAS, as a growing community, the City of Allen receives
many requests for annexation, zoning and platting of property;
and,
WHEREAS, in order to adequately analyze the effect of
any particular development on the transportation system,existing
and proposed within the City, developers are required to per-
form certain planning studies including traffic impact studies;
and,
WHEREAS, in order to provide direction and a method for
evaluating proposals submitted, City staff in conjunction with
the'traffic and transportation staff of the North Central Texas
Council of Governments has developed certain traffic management
standards.
NOW, THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE
CITY OF ALLEN, COLLIN COUNTY, TEXAS, THAT:
Section I. The attached traffic management standards are
hereby adopted as City policy.
Section II. The City staff is directed to disseminate
the standards to perspective developers and to use said
standards in the evaluation of development proposals as they
are submitted.
DULY PASSED AND APPROVED BY THE CITY COUNCIL OF THE CITY OF
ALLEN, COLLIN COUNTY, TEXAS, ON THIS THE 6th DAY OF NOVEMBER,
1986.
APPROVED:
Donald P. Rodenbaugh, MAYOR
ATTEST:
01,1araty Hendrix, C, CITY SECRETARY
Attachment To: 10/1/86
Resolution No. 762-11-86(R)
Adopted Nov. 6, 1986
CITY OF ALLEN
TRAFFIC MANAGEMENT STANDARDS
I. PURPOSE
The Traffic Impact Study (TIS) requirements acknowledge
and respond to the relationships between land uses and
vehicular traffic on the public thoroughfare system. A
TIS is intended to ensure adequate review and considera-
tion of potential impacts of proposed development on the
surrounding thoroughfare system.
II. TRAFFIC IMPACT STUDY
A. Acceptable Level of Service
A Level of Service "C" is the design objective for
the City of Allen. A TIS must attempt to identify
sufficient transportation improvements to achieve
Level of Service "C" or better operation.
B. Study Area
The minimum transportation impact study area shall
include the entire neighborhood district plus any
neighborhood district that directly abuts or is
adjacent to the proposed development.
C. Contents
Specific report requirements may vary depending on
the site location and characteristics, geographic
area, and size and type of development. However,
each major TIS must clearly state all assumptions
and methodologies used, and contain at a minimum,
the following:
1. Transportation System
a. Vicinity map that relates the site location
to the street system.
b. Thoroughfare designation according to the
City of Allen Thoroughfare Plan.
C. Number of roadway lanes, lane widths, and
right-of-way widths.
d. Traffic signal locations.
Attachment To:
Resolution No. 762-11-86'(R)
Adopted Nov. 6, 1986
D. Background Traffic
1. Use the background traffic volumes developed by
the Council of Governments (COG), subtracting out
the proposed development in question.
2. Add traffic generated by land uses that are in the
comprehensive planning tables for the neighborhood
districts under study, subtracting out development
assumed in D.1, and the proposed development in
question.
3. Assign traffic from D.2 to the City of Allen
Thoroughfare Plan and add in the D.1 background
traffic volumes.
E. Site Traffic: Trip Generation
1. Assume full development and occupancy.
2. Show in tabular form the land use components, the
trip generation rates (daily and peak hour), and
total trips generated by land use type.
3. Use Trip Generation Rates developed by ITE, Third
Edition.
4. No passer-by trip reductions allowed.
5. If project is a mixed use development
consisting of 100 acres or more, a 100
internal satisfaction ratio can be used.
A mixed use development is a project that
contains both employment and dwelling units.
F. Capacity Analysis
1. Separate maps illustrating traffic volumes for
different scenarios:
a. Non -site traffic projections (i.e., D.3 traffic)
for design year (ADT and AM/PM peak hour turning
movements);
b. Development traffic (ADT and AM/PM peak hour
turning movements); and,
c. Non -site traffic plus development traffic for
design year (ADT and AM/PM peak hour turning
movements).
Attachment To:
Resolution No. 762-11-86(R)
Adopted Nov. 6, 1986
2. Capacity analysis of roadway links shall -be performed
for the design year. Identify level of service with
and without development site traffic. If the roadway
links exhibit an LOS D, E, or F, then intersection
analyses will need to be performed for those facilities.
G. Mitigation of Impacts
1. Identification of actions needed to maintain an
acceptable level of service on the street system.
Candidate actions include:
- Roadway link and intersection improvements;
- New or modified traffic signals;
- Access locations and driveway design;
- Transportation systems management programs;
- Neighborhood traffic diverters/controls; and/or
- Transit service enhancement.
2. Capacity analysis of roadway links and intersections
in design year with transportation system enhancements
(i.e., G.1) and full project development.
H. If the proposal is significantly revised by the Commission
and/or City Council, then revised traffic figures must
be generated in order to comply with the final recom-
mendation.
I. If development generates less than 1000 trips, the
staff has the option of waiving the requirement.
J. The traffic impact study shall be completed by a
professional engineer with a background in traffic
analysis.
Attachment To;
Resolution No. 762-11-86(R)
Adopted Nov. 6, 1986
TRAFFIC IMPACT STUDY
EXAMPLE PROCEDURE
0
a
ut
M
10000 9500
N. L) • I
0
0
0
to
Ia000
0
0
0
m
1900
X064 o°
S�tE
l�
0
0
�o
9000
N.U, " 2
0
0
0
� 9 000
0
0
LA
M
on
Residential
Commercial
Land Use
Land Use
Build Out
Build Out
(Vehicle Trips*)
(Vehicle Trips*)
N.U.
#1 40,000
20,000
N.U.
#2 25,000
11,000
*Vehicle trips
for each neighborhood unit at "build out" is calculated
by using
Table 21 of
the Comprehensive Plan showing land
use in acres multiplied by the
appropriate
trip generation rate.
Development (100
Acres Total)
ITE Ave.
Land Use
Acres Magnitude
Trip Rate
EADT
Low density
residential
70 245 D.U.
10 trips/D.U.
2,450
Retail (0.25:1
FAR) 20 200,000 S.F
50.6 trips/
10,120
1,000 S.F.
Office (0.25:
1 FAR) 10 1009000 S.F.
14.3 trips/
11430
1,000 S.F.
14,000
Attachment To:
Resolution No. 762-11-86(R)
Adopted Nov. 6, 1986
(0.1) 0.1 =
Background traffic volumes
from NCTCOG map
unless development in
question was assumed in NCTCOG
demographic
data
(0.2)
Trips Generated
0.2
= From Land Use of
Trips Generated
[For
I Proposed
Neighborhood -
Use As
Development
Units Under Study
Background Traffic*
J In Question
0.2
= N.U.#1 [(40,000 + 20,000)
- (0.35 x (40,000
+ 20,000)) -14,000]
N.U.#2 [(25,000 + 11,000)
- (0.35 x (25,000
+ 11,000))]
D.2
= N.U.#1 [60,000 - 21,000 -
14,000]
N.U.#2 [36,000 - 12,600]
0.2 = N.U.#1 [25,000]
N.U.#2 [23,400]
(D.3) Traffic assignment of D.2 onto network with D.1
*Determine that 35 percent of build out vehicle trips for N.U. #1 and N.U. #2
are counted as background traffic.