City of Frisco Engineering Standards

Engineering Standards
J. Block Requirements
1. Block Length – Blocks shall not exceed one thousand two hundred feet (1,200’) in length,
measured from street ROW line to street ROW line. In the case of non-rectangular blocks,
each side of the block with lots fronting it shall not exceed one thousand two hundred feet
(1,200’), measured between the vertices formed by the extension of ROW lines at each corner
of the block. Blocks shall be further restricted so that they shall contain no more than twenty
(20) lots on one side. Blocks with a continuous series of lots longer than one thousand two
hundred feet (1,200’), measured along one or more sides, may be required to be bisected by a
pedestrian easement and a sidewalk (see Section 2.06.B.14).
2. Block Width – Blocks shall be wide enough to allow two (2) tiers of lots and shall have a
block width no less than two hundred feet (200’), except when only one tier of lots is possible
due to the size of the property or the need to back up to a Type A or B thoroughfare.
2.03 Median, Left-Turn Lane, Right-Turn Lane, Deceleration Lane, and Island Design
A. Required Median Openings and Left-Turn Lanes
1. Median openings on divided thoroughfares shall be required at all street intersections.
Median openings may be constructed to serve non-residential drives provided that the
minimum spacing requirements herein are met. Left-turn lanes are required for each street or
driveway that connects to a median opening. The design of median openings and left-turn
lanes shall accommodate potential future left-turn lanes that might serve undeveloped land.
2. All non-residential lots on a divided thoroughfare shall have direct or indirect access to a
median opening. Indirect access shall be provided through a series of fire lane and access
easements.
3. Multi-family developments on a divided thoroughfare shall have direct access to a median
opening.
4. The City can modify, relocate, or remove any existing or planned median opening to facilitate
traffic flow and/or preserve the health, safety and welfare of the Public, as reasonably
determined by the Director of Engineering Services utilizing recognized industry standards as
they exist, may be amended, or in the future arising.
B. Minimum Left-Turn Storage, Taper Length, and Median Opening Width, Location, and Spacing
Requirements
1. Left-Turn Lane Storage
a. All single left-turn lanes constructed on divided thoroughfares of ultimate cross section
width shall be a minimum of eleven feet (11’) wide. Where double left-turn lanes are
provided, each left-turn lane shall be a minimum of ten feet (10’) wide.
b. All left-turn lanes constructed as future through lanes on divided thoroughfares shall be
twelve feet (12’) wide for the entire storage and taper length requirements as listed in
Table 2.5.
Section 2 – Thoroughfare Design Requirements May 2012 Page 2-20