City of Frisco Engineering Standards

Engineering Standards
I. Alley Grade
1. Alleys shall have a maximum grade of six percent (6%). Steeper grades may be permitted
where required by topographical and/or natural features, as approved by the Director of
Engineering Services.
2. Alleys shall maintain a maximum cross-slope of two percent (2%) at the intersection of the
adjacent sidewalk.
J. Vertical Curves in Alleys – Vertical curves in alleys shall be used in order to provide a design
which is safe, comfortable in operation, pleasing in appearance and adequate for drainage.
Vertical curve alignment shall also provide stopping sight distance in all cases based on a design
speed of 20 mph.
K. Alley Screening Walls – The area between screening walls and alleys shall be paved and graded
to drain to the invert.
2.05 Driveway Design
A. Introduction – Driveway design standards are needed to provide safe and efficient vehicular
access to and from the public street system, to provide public street capacity for accommodating
peak traffic volumes of public streets, to maintain smooth traffic flow, and to maintain street
ROW and drainage. The intent of driveway design standards is to achieve the following:
1. Prohibit the indiscriminate location and spacing of driveways while maintaining reasonable
vehicular access to and from the public street system.
2. Reduce conflicting turning movements and congestion thereby reducing vehicular crashes.
B. Definition of Driveway Types
1. Residential Driveway – Provides access to a single-family residence, duplex, or multi-family
building containing four or fewer dwelling units. Residential driveways shall intersect Type
D, E, F, and G thoroughfares only (according to the restrictions described below).
2. Non-Residential Driveway
a. Commercial Driveway – Provides direct access to an office, retail or institutional
building, or multi-family building having more than four dwelling units. It is anticipated
that such buildings will have incidental truck service. Commercial driveways shall
typically access Type A, B, or C thoroughfares only, with a maximum of one (1)
driveway accessing a residential collector. In the case of multi-family developments, the
primary driveway shall access a Type A or B thoroughfare. Exceptions for connections
to residential streets are specified in the Comprehensive Plan.
b. Industrial Driveway – Serves truck movements to and from loading areas of an industrial
facility, manufacturing, warehouse, or truck terminal. A retail development may have
one or more driveways specially designed, signed, and located to provide access for
trucks, which shall be considered industrial driveways. Industrial plant driveways whose
principle function is to serve administrative or employee parking lots shall be considered
commercial driveways. Industrial drives shall access Type A, B, and C thoroughfares
only.
Section 2 – Thoroughfare Design Requirements May 2012 Page 2-33