Sandy Lk Cross L3-CS 890524 GINN, INC. CONSULTING ENGINEERS
May 24, 1989
Mr. Russell Doyle, P.E.
Coppell, TX 75019
Re: Sandy Lake Crossing
Left-Turn Lane
Dear Mr. Doyle:
We have reviewed the above referenced item as requested and offer
the following comments.
It appears the proposed left-turn layout may work. The
effectiveness and safety features of this innovative design would
need to be monitored by the City staff should it be allowed to be
installed. A variance to the Sub-Division Ordinance is still
required. If it is considered, we would recommend that the
Council. make it clear to the applicant of the City's option to
close and disallow this left-turn lane after it is installed
should safety and/or traffic flow exhibit the need to do so.
Also, we recommend that the City remain independent from this
request by requiring the developer to fund and construct this
left-turn lane themselves for liability purposes rather than as a
part of the Denton Tap Road Improvements project.
Please call me if you have any questions.
Sincerely, /~ ~
Kevin E. Peiffer, P.E.
KP/dsp
cc: John C. Karlsruher, P.E.
File 89305
17103 Preston Road · Suite 100 · LB 118 · Dallas. Texas 75248 · Phone 214/248-4900
MEDIAN ACCESS
DESIGN EVALUATION
Restricted Left Turn Access
on Denton Tap Between
Sandy Lake and Braewood
City Council
Briefing Material
Prepared by
Kimley-Horn and Associates, Inc.
12660 Colt Road, Suite 200
Dallas, Texas 75251
214/386-7007
May, 1989
POTENTIAL SIGNAL ~ EXISTING SIGNAL
Tabl. e 1
TR~P GEIIE~ATIGII FORECAST
Land Use; Density DaiLy AH Peak Hour P# Peak Hour
Trips In Out in Out
1. Service Station; 1Statim 748 11 11 13 13
2. Restaurant; 2,3~0 Sf 470 25 20 25 22
3. Restaurant; 3,780 SF 759 40
4. Restaurant; 4,687 SF 942 50 39 50 44
5. Restaurant; 3,184 SF 640 34 27
6. Restaurant; 1,505 SF 302 16 13 16 14
7. RetaiL; 4,144 SF 238 18 8 58 61
8. RetaiL; 24,748 SF 2,998 53 2~ 415 432
9. Retail; 10,825 SF 1,751 32 14 96 100
10. Supermarket; 58,629 SF 7,358 22 10 264 253
11. RetaiL; 33,000 SF 3,615 6~ 27 172 179
12. MedicaL Office; 16,700 SF 571 15 12 16 44
13. General Off~ce; 40,050 SF 691 79 12 15 77
14. MedicaL Office; 220,508 SF 7,535 20--2 15--8 60 584
TOTAL 281618 66__0 40m6 11274 1.888
9176-02.Tbl
9176.02 T-410/CD-2 of '89
368 ~ I 194 DENTON,~ TAP
1,312 -'-"' "='-- 828 '~
lol ~ ~ ~83 SANDY LAKE
2 ~ ...,,-- 2 PLANNED MEDIAN
47 j j 14.9 OPENING
REQUESTED MEDIAN
23,3 ~ OPENING
,372 ~ ~ 125 DENTON TAP
24 ~ ~ 32 (~
4s9 ~ ~ 35 BRAEWOOD
'~w,~'"t ..-,~ - @ 40 MPH DESIGN SPEED:
,~/~o~ ' MINIMUM = 300 FT.; DESIRABLE = 530 FT.
* REQUEST IS FOR RESTRICTED LEFT-TURN-ONLY
DESIGN, PROVIDING 420 FT. MEDIAN OPENING
SPACING.
2. SAFE SIGHT DISTANCE ' ~";~~f
A~.)40 MPH DESIGN SPEED - 6 LANE ROADWAy:,..-~ ~,. i-'-~
~° ~' ~'~'~ ~°~ v~"'c~s ~'"~ (s~?~ .~o~ ~,^~. ~~
B.) 440 FT. MINIMUM FOR VEHICLES' EXITING ~
RIGHT FROM THE DRIVEWAY.
I
REQUEST PROVIDES APPROXIMATELY 700 FT.
SAFE SIGHT DISTANCE FOR EACH MANEUVER.
3. EFFECTIVE LEFT-TURN STORAGE LENGTH
(UNSIGNALIZED OPERATION) USING
PROdECTED 2010 TRAFFIC VOLUMES:
MINIMUM -- 200 FT.; DESIRABLE 250 FT.
REQUEST PROVIDES 225 FT. (9-11 PASSENGER
VEHICLES)~
LEFT-TURN DECELERATION DISTANCE
@ 40 MPH DESIGN SPEED:
MINIMUM TO STOP = .315 FT. ;
MINIMUM TO 15 MPH TURN = 295 FT.
REQUEST PROVIDES .315 FT. DECELERATION
DISTANCE.
Descriptions of Photographs .L,I ............'".
Restricted Left-Turn Lanes
Picture Direction of Picture
Number Street Location City Left-Turn Lane Taken
I MacArthur Blvd. N. of Belt Line Rd. Coppell SB Facing South
2 MacArthur Blvd. N. of Belt Line Rd. Coppell SB Facing South!
3 MacArthur Blvd. N. of Belt Line Rd. Coppell NB Facing North
4 Preston Rd. N. of Plane Pkwy. Plane SB Facing North
5 Preston Rd. N. of Plane Pkwy. Plane SB Facing South
6 Preston Rd. N. of Park Plane SB Facing South
7 Preston Rd. Further N. of Park Piano NB & SB Facing South
8 Marsh Ln. S. of Keller Springs Carrollton SB Facing South
9 Belt Line Rd. N. of Walnut Hill Irving SB Facing South
10 Belt Line Rd. N. of SH 183 Irving SB Facing South
11 Belt Line Rd. N. of SH 183 Irving SB From Drive
12 Storey Ln. N. of SH 183 Irving SB From Drive
13 Belt Line Rd. W. of Addison Rd. Addison WB Facing West
14 Belt Line Rd. W. of Addison Rd. Addison IWB Facing East
15 Colt Rd. N. of Alpha Dallas '1 SB Facing South
Kimley-Horn and Associates, Inc.
12660 Coit Rd., Suite 200, Dallas, Texas
386-7007