City of Frisco Engineering Standards

Engineering Standards
5. Type A-A, A-B, and B-B intersections shall maintain a maximum slope of two percent (2%)
a minimum distance of two hundred feet (200’) upstream and downstream of the intersection.
6. Roadway connections to a Type A or B thoroughfare shall maintain a maximum slope of two
percent (2%) a minimum distance of one hundred feet (100’) upstream and downstream of
the intersection.
7. A separate grading plan shall be provided for Type A-A, A-B, and B-B intersections.
Grading plans shall account for future extensions of Type A and Type B thoroughfares for a
minimum distance of six hundred feet (600’) beyond the curb return of the intersection in all
directions.
8. At four-way intersections of parabolic streets, the reduction of the crown height shall occur
on the thoroughfare with the through gutter.
a. For Type C and D thoroughfares, the crown height reduction from six inches (6”) to three
inches (3”) shall occur through the intersection and transition from the curb return to a
point fifty feet (50’) past the curb return.
b. For Type E thoroughfares, the crown height reduction from four inches (4”) to two inches
(2”) shall occur through the intersection and transition from curb return to a point thirty
feet (30’) past the curb return.
c. For Type F and G thoroughfares, the crown height reduction from five inches (5”) to
three inches (3”) shall occur through the intersection and transition from curb return to a
point thirty feet (30’) past the curb return.
9. A minimum of nine and a half feet (9.5’) of parkway shall be maintained from the back of the
curb along the curb’s radius.
10. ROW width for a Type A thoroughfare that intersects a Type A or Type B thoroughfare shall
be one hundred forty feet (140’) for a distance of two hundred feet (200’) and then taper at a
15:1 ratio to the standard ROW width. See Figure 2.2.
Section 2 – Thoroughfare Design Requirements May 2012 Page 2-11