Latter-day-SY 930519JOHN R. HORTON
II
Archi ec
P.O. B(
FORT
METR(
(817) 5
May 19, 1993
Ken Griffin
city Engineer
City of Coppell
255 Parkway Blvd.
Coppell, Texas 75019
RE-
L.D.S. Church
MacArthur Blvd.
Coppell, Texas
Dear Mr. Griffin:
Enclosed is a copy of the requested "TraffJ
the above referenced project.
The drainage study is still in progress
forward it as soon as we receive it.
Let me know if there are any questions.
Sincerely,
A.I.A., C.C.S.
JRH/eh
encsl: One (1)
cc:
David J. May
President Watts
Bill Fowkes
)X 1537
VORTH, TEXAS 76101
:429-9363
4-0222
c Study" for
and we will
Member American Institute of Architectsl
TRAFFIC STUDY
The Church of Jesus Christ of Latter-Day S~
Coppell, Texas
Prepared for:
John R. Horton
Architect
Prepared by:
G.T. (Tom) Walton, P.E.
Consulting Traffic Engineer
May 1993
ints
EXECUTIVE SUHHAR¥
The new Church of Jesus Christ of Latter-Day Sai
in Coppell is being planned. A traffic study of
plan and its effect on the area is required by
Coppell. The details of the study are given in t
pages.
The traffic study includes a review of the site p]
and review of the traffic situation on MacArthur
the church's activity time, traffic manuevers
leave the site, the traffic to be expected from
recommendations of steps to be taken to enhanc~
flow into and out of the site.
The results of the study can be summarized
Access to the site can be adequateiy
the single divided drive.
A deceleration/right turn lane will e
operation.
U-turn manuevers
safely made.
on MacArthur Boule~
A minor adjustment to the design of th
improve outbound operation.
The need for additional access to the
indicated.
nts facility
the proposed
the City of
he following
an, a survey
Boulevard at
o enter and
the site and
the traffic
as follows:
provided by
nhance drive
ard can be
drive will
site is not
me
II.
SITE PLAN
The location of the site for the new chu~
that its access is limited to MacArthur
plan shows one drive which is made up of
pavements, both 24' wide, separated by a
median 10' wide. The drive extends int
approximately 20' to a 24' wide circulation
extends across the front of the church b
connects to 90° parking areas along both
west sides of the building. There is no
the front or north side of the building, b
entrances on both the east and west sides,
at the rear. A large parking area is proc
rear of the building.
The proposed site plan shows a deceleration
the entire MacArthur Boulevard frontage of
sidewalk is also shown across the site, wh
to an existing walk along the south side
to the east of the site. Notations have b
the site plan of negotiations with the Copp~
dent School District to obtain an easemen
school frontage for the deceleration lane
easement across the south side of the sch
gain access to Samuell Road.
AREA ACCESS/CONDITIONS
The site for the new church is located i
eastern portion of the City of Coppell. The
roads used to approach the site are MacArth~
and Samuell Road.
MacAurthur Boulevard - According to
Coppell Major Thoroughfare Plan given in
Functional Classifications and Design S
the City of Coppell, MacArthur Boulevar,
Arterial and is planned to have three 1~
direction with a 17' median. At this
operating as a four lane road with t~
each direction. It has two roadways 22
36' median. By design, when complete
Boulevard is planned to have a capacit
trips per day.
MacArthur is the eastern most arterial
of Coppell. It is also important fro~
perspective as it provides a connection
in Irving on the south to Lewisville o~
In Coppell, it connects with Sandy Lake R
mately 3/4 mile south and Beltline R
mile south of Sandy Lake Road. The
connect to IH 35E, Carrollton and p
ch dictates
.evard. The
two one-way
landscaped
o the site
aisle which
uilding and
he east and
entrance on
~t there are
as well as
ided to the
lane across
~he site. A
.ch connects
,f MacArthur
een made on
ill Indepen-
across the
and also an
ol tract to
the north
two primary
~r Boulevard
:he City of
the Roadway
:andards for
! is a Major
~nes in each
time, it is
to lanes in
' wide and a
~, MacArthur
y of 35,000
in the City
a regional
from SH 183
the north.
odd approxi-
odd another
e roadways
ints east.
i/
III ·
In the area of the church site, MacArth~
median opening opposite the east prope
the site which serves the residential s
intersects MacArthur from the north.
lane with 80' of storage is provided f,
traffic. There is anotherh860'0 median c
west. A left turn lane wit ' of sto~
vided for westbound traffic. These
features are shown in the drawing a
approximate location of the site.
2. Samuell Road - In the City of Coppell
Plan, Samuell Road is indicated as
street with parking permitted on both s
a reinforced concrete roadway with curb
and the pavement is 44' wide B-B. Samu~
a total length of approximately one mi
north and south from Sandy Lake Road
Boulevard. At the present time, there i~
span-wire mounted traffic signal at the
of Samuell and Sandy Lake. There is
stop control at the intersection of Samu
Parkway Boulevard. A permanent traffi
now under construction at the intersectic
Road and MacArthur Boulevard. This si~
the closest major traffic control de~
site of the new church.
The area around the proposed church is rap~
ping. To the north and west of the site a]
residential subdivisions. Between the site
Road to the west is an undeveloped school
site is bordered on the east by a reside
that is now under development. Further t
and east there are several rapidly developing
subdivisions.
Traffic approaching the site from the.south
Boulevard will have to make a U-turn at
opening west of the church and a right t~
drive. To return to the south, a simple ri~
of the drive is all that is necessary. Those
the site from the north on MacArthur need
right turn into the drive. To return, a
from the drive, followed by a U-turn at
opening is the most obvious route. An ana
U-turn manuevers is given later in this stu
U-TURN AND DRIVE OPERATION
Traffic approaching the site from the s
MacArthur Boulevard will make a U-turn at
opening opposite the school site. They wi
-2-
Lr has a 60'
~ty line of
ireet, which
R left turn
,r eastbound
,pening 422'
~age is pro-
geometric
d also the
horoughfare
Collector
'des. It is
and gutter
~11 Road has
e. It runs
o MacArthur
a temporary
ntersection
a four-way
~11 Road and
i signal is
n of Samuell
nal will be
ice to the
dly develo-
e completed
and Samuell
site. The
ntial tract
the south
residential
~n MacArthur
the median
rn into the
ht turn out
approaching
only make a
right turn
the median
.ysis of the
ty.
utheast on
the median
1 then make
NEW CHURCH
SITE
LAKE FOREST
DRIVE
IV.
Ve
VI.
a right turn into the drive. When departir
they can simply make a right turn onto MacA
approaching from the northwest will enter
making a right turn into the drive. Whet
they may turn right from the drive and en
turn lane at the intersection median openi
U-turn.
Departing traffic will have to cross bo!
lanes to enter the left turn lane, so la
eastbound traffic on MacArthur will be imp.
inbound traffic will have to cross both la~
bound traffic to make their U-turn and tu
drive. A deceleration and right turn lan
them a refuge prior to actually making
turn.
TRAFFIC GENERATION
Based on information given in the Janual
Edition of Trip Generation, published by t
of Transportation Engineers, the traffi,
during the peak hour of church activities i
This figure is calculated based on the pro
feet2 size of the new church.
CHURCH DEMOGRAPHICS AND ACTIVITY SCHEDULE
The new church is planned to be used by
congregations. They will attend servcies
facility at different times on Sundays. On
be made up of church members who live in
southern Lewisville and Flower Mound. Th~
at the new church from 8:00 a.m. to 11:
other group will be members living in Ca
will meet at the new church from 1:00 p.m.
It is estimated that the first group will h
bers and the second will have 208 members.
SITE IMPACT ANALYSIS
In order to determine the effect that the
will have on MacArthur Boulevard, a tr~
analysis was completed. The analysis invo
of (1) the effectiveness of the proposed
the effect that the U-turns at the two med
will have on MacArthur traffic, (3) the
design of a deceleration lane on MacArthu
and (4) the need for access from the sit,
school site to Samuell Road. The analysJ
worst case situation. In this case, th~
traffic volume for the church is that cal
-3-
g the site,
rthur. Those
the site by
departing,
er the left
~g to make a
h eastbound
:ge gaps in
~rtant. The
es of east-
rn into the
m will give
their right
:y 1991 5th
~e Institute
~ generated
s 239 trips.
used 25,506
wu separate
at the new
group will
Coppell and
~y will meet
0 a.m. The
:rollton who
to 4:00 p.m.
ave 254 mem-
new church
.ffic impact
lved a study
riveway, (2)
lan openings
teed for and
r Boulevard,
~ across the
.s assumes a
t means the
~ulated from
the Trip Generation Manual. The inbound
assumption is that 50% of the peak hour
inbound and 50% outbound. With the two exi~
openings on MacArthur, it will not be
construct one to serve the church traffi
The proposed driveway will operate wit[
turns inbound and right turns outbound
inbound and outbound flows will operate
file. The large (24') inbound lane w
smooth turn and allow traffic to clea
to outbound
traffic is
~ting median
possible to
c directly.
only right
· Both the
in a single
[11 allow a
r the right
lane of MacArthur Boulevard quickly. The outbound
lane is also 24' wide, but this may not b~ desirable.
A lane that wide will encourage exitin$ traffic to
line up two abreast. This can causeI visibility
problems for the right vehicle. In addition, both
cars may attempt to make their right t'urns at the
same time. Consideration should be give~ to reducing
the width to the exit lane to 14' t~
median island proposed in the drive wi
any conflict between inbound and outbo
The size and design of the drive will
accomodate the expected traffic volu
U-turns on a divided thoroughfare can
lems. The potential for problems is
several factors, including the width
available for the turning manuever, the
of a protected storage lane to wait
turn, the visibility of traffic appr¢
the opposite direction and the volume an
of opposing traffic. On MacArthur BoL
bound traffic to the site can make
existing westbound left turn lane for
west of the site. The outbound traff
use of the existing eastbound left tu
the opening at the east boundary of
Visibility to the east along MacArthur
over 1000'. To the west, there is a fl
but approaching traffic can be seen
the Samuell Road intersection.
In order for the largest private auto
pickup, etc., to make a U-turn, a mini
48' of pavement is needed. On MacArthu
the width of pavement from the right
left turn lane to the right curb of
lanes is measured at 58'. The requir
therefore be made with relative ease.
The primary concern when making a U-t
traffic coming from the opposite direcl
intersection such as the one at the east
-4-
16'. The
1 eliminate
nd traffic.
allow it to
nes easily.
cause prob-
effected by
of roadway
~vailability
~o make the
aching from
d regularity
~levard, in-
use of the
the opening
[c can make
rn lane for
the site.
is clear for
entle rise,
~om west of
i.e., van,
~um width of
~ Boulevard,
side of the
~he opposing
ed turn can
urn is with
ilon. At an
ern boundary
of the church site, there is also c
vehicles entering from the cross stree~
was done of the existing traffic alor
Boulevard. The amount of traffic east- a
was counted and also the various turni
at the intersection were recorded. Th~
done on Sunday to cover the beginning
times for the services for the two ch~
The Sunday services are the only tim
whole group attends at one time. Ther
when both groups are at one service.
of the survey are shown in the followi
drawing. The drawing shows the vario
that were recorded.
The survey shows that the through movement
at just over 60 vehicles per direction in
period. If the traffic were distributed
time, there would be a maximum of four
minute or one vehicle every 15 seconds.
traffic was actually observed passing in gr
two to five vehicles, there are often large
cars. These gaps will allow easy flow of
and out of the driveway and also little cz
traffic making U-turns at either of the medi
In the future, there may be some increase i
MacArthur as the residential areas to th~
east build out, but it is doubtful that
volumes will increase to the point of creati
from the church. In addition, the traffic si
under construction at the intersection o
Boulevard and Samuell Road can be expecte¢
gaps in the traffic approaching from the
church traffic, either exiting at the dri
turning at the western median opening, will
take advantage of these gaps.
The need for a deceleration lane and right
serve a driveway is generally demonstrated
inbound traffic volume and/or a congestio
that may create a queue on the street app~
drive. The inbound traffic volume during
of the church activity should be easily a~
the 24' wide entry aisle of the drive.
T
that queueing might occur is if an onsite
situation were to make it impossible for en
fic to clear the drive. If a very large
the congregation were to arrive at virtual
time, this might occur. If a deceleration
vided, it should be 11' to 12' wide and
design as the left turn lanes at the media
i.e., 80' of storage length and 120 of
oncern with
:. A survey
.g MacArthur
nd westbound
~g movements
survey was
and ending
rch groups.
s that the
is no time
The results
~g table and
~s movements
volumes peak
a 15 minute
evenly over
chicles per
Since the
~ups of from
gaps between
traffic in
.nflict with
an openings.
traffic on
south and
the Sunday
.g a problem
nal that is
MacArthur
to provide
west. The
eway or U-
be able to
~urn lane to
by a large
situation
~oaching the
~e peak hour
:omodated by
he only way~
congestion
~ering traf-
~rcentage of
ly the same
lane is pro-
ve the same
n openings,
transition.
Eastbound Eastbound Westbound Westbou~d Southbound Southbound
Left (EBL) Right(W~IR) Left (SBL) Right(SBR~t
12 2 8 2 ! 3
7 2 8 1
11 ! 7 ! 1
18 I 3 19 6 3 2
12 32 3 1 2
40 3 I 30 3 5 2
31 2 43 2 3 2
39 2 53 4 11 3
35 ~ 62 3
25 2 57 2 4 I
45 ~ 52 5 6 I 3
50 1 45 4 2 6
51 1 a, 5 1 3 3
46 a8 5 1 5
64 2 61 3 3
I
5/16/93
SUNDAY
7:45-8:00a.m.
8:00-8:15a.m.
8:15-8:30a.m.
lO:30-10:aSa.m.
lO;.~5~!!.:OOa.m.
ll:O0-1!:15a.m.
ll:lS-1!:30a.m.
12:30-!2:45p.m.
12:45-1:OOp.m.
l:O0-!:lSp.m.
l:lS-l:30p.m.
3:30-3:45p.m.
3:45-4:00p.m.
4:00-4:lSp.m.
4:15-4:30p.m.
NEW CHURCH
SITE
LAKE FOREST
DRIVE
VIII.
The need for an additional accessway to the
the school site from Samueil Road would be
in the same way as the decleration lane, if
drive on MacArthur Boulevard could not handl
ted traffic into and out of the site. An~
deration might be the elimination of a se
hazard. In the proposed situation, the expe
volume should not create an operational pr,
drive. In addition, the information given
cates that U-turns which must be made to
site can be safely done by making use of
median openings and left turn lanes.
CONCLUSIONS AND RECOMMENDATIONS
The information developed in this study lea
ber of conclusions and recommendations.
Conclusions:
The proposed site plan will provide smooth
of on-site traffic.
The traffic generated by the proposed ch~
adequately served by the single drive propo~
Existing and expected traffic on MacArthu
will provide large gaps in traffic for e
departing traffic. The eastbound gaps can
by the new traffic signal.
The U-turns necessary to approach and lea
can be safely made.
A deceleration and right turn lane is not
expected traffic volume, but will enhan
traffic.
The need for access across the school tract
of Samuell Road is not indicated by the expec
especially with the deceleration/right turn
Recommendations:
The proposed driveway design should be adju~
vide a 14' to 16' exit lane to eliminate the
of a double right turn movement.
The deceleration/right turn lane should
with 80' of storage and 120' of transition.
Members of the congregation who live sou~
west of the site should be requested to a
site from Samuell Road onto MacArthur and r
south on MacArthur to eliminate the need fo
the U-turning traffic as possible.
-6-
site across
emonstrated
he proposed
the expec-
,ther consi-
:ious U-turn
cted traffic
~blem at the
above indi-
~pproach the
he existing
Is to a num-
circulation
rch can be
ed.
Boulevard
ntering and
be enhanced
e the site
adicated by
e entering
to the west
:ed traffic,
lane.
ted to pro-
possibility
e designed
h, east or
pproach the
turn to the
as much of