ST9904-CS100719L l- � Kt t -7- 2'P tO C c- i
AF Texas Department of Transportation
P.O. BOX 133067 • DALLAS, TEXAS 75313 -3067 • (214) 320 -6100
Roadway Illumination
Control: 0364 -2 -17
SH 121: From: Tarrant County Line
To Denton Creek
City of Coppell
Denton County
Mr. Ken Griffen, P.E.
Director of Engineering
City of Coppell
PO Box 9478
Coppell, TX 75019
Dear Mr. Griffen:
OL"f C '. ,
As discussed, TxDOT is preparing the plans to rebuild SH 121 through the Cities of Coppell
and Grapevine. Any existing illumination will be removed as part of the roadway
reconstruction. We want to clarify the design criteria along with construction, maintenance
and operation responsibilities of TxDOT and the respective cities for each type of
illumination system.
Safety lighting system design would include three (3) illumination standards at the entrance
and exit ramps, one light standard where the ramp merges with the frontage road and
illumination standards at the intersection of the frontage road and cross street if traffic
signals do not exist. The State will be responsible for all costs associated with the
construction, power and maintenance of safety lighting system; however, the City will be
responsible for the maintenance of the system and request reimbursement from the State
for their actual costs.
A continuous illumination system would light the SH 121 main lanes in addition to the points
noted in the safety lighting design. Continuous lighting systems can be designed using 150
foot high mast towers spaced at approximately every 900 feet; or 50 foot conventional poles
on the concrete median barrier spaced at 280 feet. We reviewed the airway highway
clearances for this project and have determined that high mast poles can be used on this
project. In addition, we attended a demonstration of a mock up design for neighborhood
friendly fixtures for a highmast tower designed and were pleased with the results of the
ability to cut off any back lighting from the high mast tower.
We have been working with the city of Grapevine to determine their preference on roadway
lighting for this project. Since Grapevine and Coppell city limits meet at the highway right of
way, TxDOT's procedure is to work with both cities to determine the one type of lighting
system for the project, enter into lighting agreements and define the limits and responsibility
of each agency. Although your city limits are east and west of the highway we would divide
the lighting circuits north and south and determine responsibility.
THE TEXAS PLAN
REDUCE CONGESTION • ENHANCE SAFETY • EXPAND ECONOMIC OPPORTUNITY • IMPROVE AIR QUALITY
INCREASE THE VALUE OF OUR TRANSPORTATION ASSETS
March 3, 2010 - 7 . � . 10 M e(c+u- t "tov%� x,60 AV-
-7, r grr0
I o,Le.
An Equal Opportunity Employer
Page 2
March 3, 2010
Mr. Griffen
Prior to commencing the design of a new illumination system we would like to know what
type of lighting the City of Coppell prefers. Grapevine indicated they support the installation
of a neighborhood friendly high mast illumination system.
Please review this information and notify us as soon as possible if the City of Coppell is
supportive of neighborhood friendly high mast illumination for this facility. A copy of the
agreements and an estimate of the costs of each type of system are attached for your
reference. Feel free to contact me at, 214 - 320 -6229, concerning this issue.
Sincerely,
elanie B. Yo ng E.
District Trans tion Operations Engineer
Attachments
cc: Jerry Hodge, City of Grapevine
Illumination Systems Cost Estimates per Mile
Continuous Lighting — TxDOT pays 100% of Construction
Municipality pays 100% of Operation and Maintenance (Electricity& Repairs)
Continuous Lighting with Conventional Poles
50' Median Mounted with 400 W HPS (based on 260' spacing)
Construction
$175,000 mile
Maintenance
$5500 /year
Electricity
$4200 /year
50' House Side Mounted with 400 W HPS (based on 260' spacing)
Construction
$290,000 mile
Maintenance
$8000 /year
Electricity
$4200 /year
40' Median Mounted
with 250 W HPS (based on 220' spacing)
Construction
$150,000 mile
Maintenance
$4500 /year
Electricity
$3400 /year
jr Continuous Lighting with High Mast Poles
150' Towers with 12 -400 W HPS (based on 850' spacing)
Construction $650,000 mile
Maintenance $2200 /year
Electricity $8000 /year
Safety Lighting — TxDOT pays 100% of Construction, Maintenance and
Operation
Safety Lighting
40' poles with 250 W HPS (18 /interchange)
Construction $100,000 /interchange
Maintenance $3500 /year
Electricity $1500 /year
Revised 9/07
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