Lakes of C FS-SY 840321 CONSULTING TRAFFIC ENGINEER
May 9, 1984
Mr. Wayne Ginn, P.E.
Ginn, Inc.
16135 Preston Road
Suite 106
Dallas, Texas 75248
Dear Mr. Ginn:
I completed my review of the Thoroughfare Planning Analysis
for the Lakes of Coppell. In general I find the approach and
the calculations used in the study are consistent with good
Traffic Engineering practice. The information and assumptions
appear to be accurate. In the recommendation area there are what
appear to be two inconsistencies.
1. The recommendation that MacArthur Drive be a 4-lane
divided roadway is not consistent with the traffic
volume shown at the south end of this roadway in the
subject tract, and the capacity indicated in Table I
of the study. The volume shown is in excess of the
given capacity for a 4-lane divided thoroughfare. This
would seem to indicate that MacArthur Drive should be
proposed as a 6-lane divided roadway. In addition,
if MacArthur Drive is a major roadway in the thorough-
fare plan for the City of Coppell, this would indicate
the need for a high type 6-lane divided thoroughfare.
2. A recommendation is made that the intersections of
MacArthur Drive with Samuels and the two intersections
of the loop road be striped to allow two 9 foot out-
bound lanes and one 18 'foot inbound lane. This appears
to be appropriate on the 37 foot loop road, however,
Samuels Drive is proposed as a 4-lane undivided roadway
and therefore will have an existing cross section of
45 feet which will provide for two lanes inbound and
outbound at the intersection.
Very truly yours,
G. T. (Tom) Walton, P.E.
GTW:ctg
1916 PORTS O'CALL · PLANO, TEXAS 75075 · (214) 596-7382
TRILP. ND
March 28, 1984
H. Wayne Ginn
Ginn, Incorporated
16135 Preston Rd.
Suite 106
Dallas, TX 75248
Re: Lakes of Coppell
Dear Wayne
Attached is a copy of the traffic study performed for the above
project. Please contact me with any questions.
Sincerely
TRILAND DEVELOPMENT, INC.
Vice President
Engineering and Consturction
Triland Development, Inc. · One Lincoln Centre, Suite 1000 · 5400 LBJ Freeway · Dallas, Texas 75240 · (214) 934-1234 · Telex 794183
THOROUGHFARE PLANNING ANALYSIS
-" FOR
THE LAKES OF COPPELL
MARCH, 1984
PREPARED BY
DeSHAZO, STAREK & TANG, INC.
330 UNION STATION
DALLAS, TEXAS 75202
Engineers · Planners
330 Union Station · Dallas, Texas 75202 · 214/748-6740
TECHNICAL MEMORANDUM
TO: Lynn Kadleck
FROM: DeShazo, Starek & Tang, Inc.
DATE: March 21, 1984
SUBJECT: Thoroughfare Planning Analysis For the Lakes of
Coppell, J84067
SCOPE
This memorandum evaluates the traffic operations on the internal
and external roadways of the proposed thoroughfare system located
in the Lakes of Coppell.
STUDY ACCESS
The site of the proposed development is located in Coppell, Texas
(See Figure 1) west of Denton Creek and north of Sandy Lake Road.
The development's main access, Sandy Lake Road, runs east to
1-35E where its name becomes Whitlock, and west to Coppell Road
just short of SH 121.
The specific site is 333 acres. Initial land use densities indi-
cate a potential development mix as follows: 4,225 dwelling
units, 120,000 square feet of office, and 5 acres of
recreational. The total, 24-hour, weekday generation will be
30,912 trips (A.M. peak hour trips - 2,543, P.M. peak hour trips
- 3,384).
Figure 2 is a map of the site with its proposed street con-
figurations. MacArthur is to be extended north from the Valley
Ranch subdivision. It will cross Sandy Lake Road where Allen
Road presently is located. MacArthur Boulevard is designed to
pass through the center of the development and north to 1-35E, FM
3040, or SH 121. Its exact destination will be determined by the
City of Coppell and City of Lewisville officials.
I ! I I I I I i I I ! ! ! ! I ! I I !
FIGURE 1: ~
LOCATION MAP
'.--DeShazo, Starek & Tang, Inc.
,- ~ FIGURE 2:.
SITE MAP
... PROPOSED DEVELOPMENT TRIP GENERATION
.- Using trip generation 'factors for offices and single family,
multi-family, and townhouse dwellings developed by the Institute
of Transportation Engineers and fine-tuned for the Dallas area by
DeShazo, Starek & Tang, Inc., the traffic volumes generated by
-- this development were calculated. During the A.M. peak, the
development will produce 713 inbound and 1,830 outbound trips.
The most critical time period will be during the P.M. peak hour
.. with 2,113 inbound trips and 1,271 outbound trips.
TRIP ORIENTATION
Year 2000 traffic projections were used to determine the trip
-- orientations for the development. The percentages were assumed
as follows:
Inbound Trips: 15% from north
35% from south
20% from west
30% from east
..
Outbound Trips: 15% to north
.- 35% to south
20% to west
30% to east
The resulting peak hour volumes were determined at each intersec-
-- tion and along each roadway link.
STREET SIZES
One objective of this study is to recommend efficient area street
sizes. Once the generated trips for both this and other planned
area developments have been distributed, they are assigned to the
streets they will use (see Figure 3). By comparing the total
volume of cars traveling both directions on each street to the
street capacities shown in the following table (Table I), the
recommended street sizes are determined (Table II).
_ ~ FIGURE 3:
24-HR. TRAFFIC VOLUMES
- For Year 2000
.. ~,.,..,~580
! '
! SFO-3
~ SFG
~ 3'1 a~;.
.
I 12 ~. AC. ·
5,660 ~ ' '~* :
[J ~ T~-~ ,
g AC.
SFG - 1
is A~
0 ~KES OF COPPELL '
COPPELL, TEX~
__ ~ ~ 7 ~. MF2-~ .
Tffi~ND DEVELOPME~. I~
~ooo '~' ~ 11' ~9,~oo
-- TABLE I
CAPACITIES IN VEHICLES PER DAY (VPD)
FOR THOROUGHFARES**
LINK CAPACITY
.= 6-Lane Di vi ded* 37,800
4-Lane Divided* 25,200
4-Lane Undi vi ded 18,000
2-Lane Undivided 10,000
" *Median capable of protecting extra turn
lanes
-- **Capacity based upon Level-of-Service D
-' TABLE II
-- RECOMMENDED STREET SIZES
STREET SIZE
-- Sandy Lake 6-Lane Divided
MacArthur 4-Lane Di vi ded
Village Parkway 2-Lane Undivided
_ Samuel Blvd. 4-Lane Undivided
Allen Blvd. 2-Lane Undivided
DeForest 2-Lane Undivided
Loop Road 2-Lane Undivided
Table III summarizes standard pavement widths and rights-of-way
associated with specific street classifications in the City of
Coppel 1.
TABLE III
.- STANDARD PAVEMENT WIDTHS
AND
RIGHTS-OF-WAY
RIGHT-OF-WAY WIDTH
WITHIN
STREET DESIGN CLASSIFICATION PAVEMENT MEDIAN DESIRABLE 900' OF
-- WIDTH* WIDTH INTER-
SECTION
6-Lane Divided Major
Arterial 2-34' 16' IlO' 120'
4-Lane Divided Major Arterial 2-25' 16' 90' 95'
4-Lane Undivided Minor Arterial 45' . 70, _
_ 2-Lane Collector 37' . 60, _
2-Lane Local 28' - - -
* - Recommended standards, not formally adopted by the City of Coppell.
_ CAPACITY ANALYSIS
Capacity analyses were performed on every intersection shown in
Figure 2 using the street sizes described in Table II. Left turn
-- storage was assumed where medians exist. Calculations were based
upon a calculated worst-case situation during the P.M. peak hour
based upon projected year 2000 volumes. The calculated level of
-= service at each intersection is shown on Table V.
TABLE V
INTERSECTION UNSIGNALIZED SIGNALIZED
LOS LOS
Sandy Lake/MacArthur - E
_ S. Loop Road/MacArthur F B
Vi 11 age Parkway/MacArthur F A
N. Loop Road/MacArthur E
Samuel/MacArthur D
-- DeForest/MacArthur B
Samuel/Sandy Lake - B
Village Parkway/Samuel D
Results of this analysis indicates that certain intersections can
be indentified as intesections that could potentially warrant
-- future signalized control. These are Sandy Lake/MacArthur, South
Loop Road/MacArthur, Village Parkway/MacArthur, and Samuel/Sandy
Lake. By indicating which intersections may require signaliza-
-- tion preparation can be made to have the signals installed when
they are actually warranted. In this manner, funding can be
bOdgeted in advance of the time when installation is needed.
RECOMMENDATIONS
Based upon the analysis results, the following recommendations
-- are presented:
Street pavement.widths and rights-of-way should be designed in
-- accordance with Table II and III. Specific street designs are
as follows:
o Sandy Lake - Major Arterial (6-lane, divided)
o MacArthur - Major Arterial (4-lane, divided)
Village Parkway - Collector (2-1ane,'undivided)
Samuel Blvd. - Minor Arterial (4-lane, undivided)
Allen Blvd. - Local (2-lane, undivided)
DeForest - Collector (2-lane, undivided)
Loop Road - Collector (2-lane, undivided)
- On-street parking should not be allowed along MacArthur,
Sandy Lake Road, Loop Road, Village Parkway, and Samuel
.= Boulevard.
- At their intersections with MacArthur Boulevard, Samuels and
the two legs of the Loop Road should be striped to allow for
" two 9-foot outbound lanes and one 18-foot inbound lane.
- Village Parkway should be widened within 250 feet of Samuel
-- Boulevard to provide for a sheltered left turn lane.
- If DeForest is extended to the east past the Lakes of
Coppell, Allen Road will provide an attractive by-pass route
to MacArthur. This type of cut-through traffic will be
detremental to the character of the planned single-family
area. If access to the MF2-1 Tract was limited to ony one
driveway off Allen Road, then it is recommended that Allen
Road be constructed as a 26-foot local street. The roadway
should widen to a 36-foot section within approximately
-- 200-feet of MacArthur.
- Future signalization may be required at the following
intersections:
o Sandy Lake/MacArthur
o S. Loop Road/MacArthur
-- o Village Parkway/MacArthur
, o Sandy Lake/Samuel
_ - Samuel Boulevard should be widened to provide left turn
storage at its intersection with Village Parkway and Sandy
Lake Road.
- Corner radii for intersecting streets with MacArthur should
be designed to handle S.U. Design Vehicle (approx. corner
radius : 35 feet).