ST8401-CS 850311DALLAS COL
PUBLIC WORKS
March 11, 1985
RECEIVED
Ms. Janet Vick
Nathan D. Maier
Consulting Engineers, Inc.
Three NorthPark
8800 N. Central Expressway
Suite 300
Dallas, Texas 75231
NATHAN D. MAIER
CONSULTING ENGINEERS
Re: Intersection of MacArthur and Belt Line Road in Coppell
Dear Ms. Vick:
Reference is made to your February 27, 1985 letter of transmittal
and the attached construction plans for proposed MacArthur Boule-
vard and Belt Line Road intersection.
We have reviewed your plans and inspected the location in the
field. Following are our comments and recommendations:
Sheet 5
1. In order to reduce the cross slope on Belt Line within
the intersection, it is recommended that the PVI at Sta. 35+75 be
moved to the centerline of Belt Line at Sra. 36+85(~). The PVI
should be moved forward at least to half-way between the railroad
and Belt Line centerlines.
2. It is suggested that the gradeline on MacArthur south of
Belt Line be as gentle as possible to facilitate the functioning
and safety of the intersection.
3. The -0.50 percent grade to the south of Belt Line appears
to be lower than necessary commensurate with the existing ground
elevations shown.
Sheet 6
1. The crest vertical curve on Belt Line at PVI Sta. 8+00
is short. It is recommended that the curve length provide for a
desirable design speed of 50 mph.
2. The maximum cross slope shown on the Future Typical Sec-
tion should be 1/4"/foot and the one foot fall across the median
is too great. The median width should be fourteen feet back of
curb to back of curb or fifteen feet out to out.
161 Commerce Dallas, Texas 75209 749-8151
.~ 11, 1985
Janet Vick
3. It is recommended that the full pavement width (81 feet)
be carried 100 feet each direction on Belt Line Road from the end
of the curb returns.
4. The asphalt connections need a shoulder or some treatment
to provide for lateral support and edge safety on this high fill
section. A guard fence may be needed. The side slopes will be
too steep unless slope easements are used. Too, the fill slopes
may cover or restrict the ditches where the side road culverts are
shown.
Sheet 8
It appears that some of the recently placed concrete pavement
will need to be removed to provide for the proposed intersection.
Thank you for the opportunity to review these plans.
any questions, please advise.
Sincerely, . /
T. R. Kennedy ~_~
Assistant Director
TRK: Sgr.~C' ~
cc: M B. Rogers
Director
Streets Department
City of Coppell
If you have