TR0801-CS071227
Page 1 of2
Rhonda Adloo - Traffic Signal Riverchase@Sandy Lake
From: Ken Griffin
To: DMorrow@hitachiconsulting.com
Date: 12/27/2007 9:40 AM
Subject: Traffic Signal Riverchase@Sandy Lake
CC: DiWanna Baskins; Keith Marvin; Michael Garza; Rhonda Adloo
Mr. Morrow
We have begun the process of collecting data to perform a traffic study at Riverchase and Sandy Lake.
There are required warrants that must be met before a traffic signal is recommended at an intersection.
The warrants are in the "Texas Manual on Uniform Traffic Control Devices". Coppell, like most cities
in Texas, has adopted the Manual to ensure the legal and consistent application of traffic control
devices placed on roadways. There are eight warrants that are evaluated that generally cover: volume
(eight hours, four hours & peak hour); pedestrian volume; school crossings; coordinated traffic signal
system; accident history; and overall roadway network. If a traffic signal is warranted, the signal is
designed, funds are appropriated, the work is bid, the bid is awarded to the lowest responsible bidder at
a Council meeting and the signal is installed. Experience has shown that the process from beginning to
end is about one year and the cost is generally in the $200,000 range. I have already begun the process
of trying to appropriate funds in the event the signal is warranted.
Hopefully this information has been helpful. If you should have any additional concerns or comments
please feel free to contact me at the email or phone number listed below.
>> "Morrow, Dennis" <DMorrow@hitachiconsulting.com> 12/14/2007 10:10 AM >>>
Engineer:
I live at 201 Longmeadow Drive in Coppell and travel through this intersection frequently during rush
hour. During this time it is quite difficult to turn onto Sandy Lake, especially a left turn.
There seems to be a steady flow of traffic in both east & west directions during the rush hour periods
(mostly well in excess of 40 mph). With the widening of Sandy Lake there are as many as 3-4 lanes to
cross to make a left-hand turn. The other difficulty seems to be judging the speed of westbound traffic
with the angle of vision from Riverchase. The westbound traffic is coming toward you and then curves
just prior to Riverchase.
When the construction was started on Sandy Lake I was under the impression that a signal was planned
for this intersection. Is that in the plans?
The only light to control the westbound traffic is located at the George Bush tollway approx 1 mile
away & the closest light controlling eastbound traffic is at MacArthur approx ? mile away.
I don't feel we need this signal fully operational all day or on weekends (it could flash caution during
file://C:\Documents and Settings\rbrother\Local Settings\Temp\XPgrpwise\47737314City _... 1/11/2008
Page 2 of2
non-rush hour times), but it would be very useful during rush hours.
I have polled others in our neighborhood watch group and have included there responses. Please take
the time to review them as they are representative of the concerns of others using this intersection.
We just don't want to wait for frequent accidents at this intersection before a signal is installed.
Thank you for your consideration and look forward to your response.
Denny
Others concerns:
Prom: Terah Paolini [mailto:tlpaolini@yahoo.com]
Sent: Tuesday, November 13,2007 9:02 PM
To: Al & Pat Enlow
Subject: Re: Intersection - Sandy Lake & Riverchase
Ken Griffin, P. E.
Director of Engineering & Public Works
972-304-3686
kgriffin@ci.coppell.tx. us
file://C:\Documents and Settings\rbrother\Local Settings\Temp\XPgrpwise\47737314City _... 1/11/2008