TR0801-CS100825
(9/7/2010) Keith Marvin - Re: Signal at Riverchase and Sandy LakePage 1
From: Keith Marvin
To:Chaffin, David
CC:Birdsall, Per; Marshall, George
Date: 8/25/2010 1:58 PM
Subject: Re: Signal at Riverchase and Sandy Lake
Mr. Cahaffin,
The City of Coppell is in the process of installing a new traffic signal at the intersection of Sandy Lake Road and Riverchase
Drive. This traffic signal was added to our CIP (capitol improvement plan) plan shortly after the widening of Sandy lake
Road was completed.
Prior to adding a traffic signal to our CIP plan we must evaluate to determine if the installation is warranted. 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. Once 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.
In this case the contract was awarded in April of this year, and the work should be complete by the end of October. We
will be installing video detection devices on this signal that will detect cars waiting on the Riverchase Drive leg, and the
driveway leaving the nursing home on the north side of Sandy Lake. Sandy Lake will maintain a green light until it detects
a car waiting.
The portion of the signal associated with the private driveway on the north side of the road was paid for by the nursing
home developer.
Feel free to contact me if you have any more questions.
Keith Marvin, P.E.
Project Engineer
(972) 304-3681
>>> David Chaffin <davideo35@yahoo.com> 8/24/2010 12:43 PM >>>
I live off Riverchase and I recently noticed a sign indicating there may be a
new traffic signal at Riverchase and Sandy Lake. Is this true?
During our 12 years in the Riverchase neighborhood, my wife and I have never
thought that intersection needs a signal. We'd be very interested in knowing
what research led the City to determine that a signal is needed there. If there
will be a signal, will sensors be used to make sure Sandy Lake traffic never has
a red light when no cars are stopped at Riverchase?
Sincerely,
David Chaffin
1301 Breanna Way