HomeMy WebLinkAboutIR 9983 INFORMAL REPORT TO CITY COUNCIL MEMBERS No. 9983
To the Mayor and Members of the City Council January 31, 2017
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rrn SUBJECT: ROADWAY INTERSECTION VIEW/SIGHT TRIANGLES
The purpose of this informal report is to provide information on the establishment of roadway intersection
view/sight triangles and maintenance/management procedures.
A visibility or sight triangle is the triangular area adjacent to the roadway intersection of any public street or
alley which is preserved to protect visibility for vehicular traffic and within which no obstruction should be
placed which would block the sight lines for drivers. Typically, this triangle restricts visual or physical
impediments or obstructions to the vertical view between 2 and 7 feet in height.
The triangle is established using the guidelines published by the American Association of State Highway
and Transportation Officials (AASHTO). The dimensions of sight triangles vary with the intersecting
roadway classifications, the speed of traffic on the roadways, the type of traffic control used and the
horizontal and vertical geometric characteristics of each particular location.
If a sight obstruction is reported or observed, the following measures are applied:
1. For vegetation, small structures or signs - After initial field observations/measurements, the
property owner is notified to trim, relocate or remove any obstructions within a certain time frame
(typically 10 business days) If, after that timeframe, it's still not in compliance, coordination with
code compliance or parks/forestry department is initiated to remove the obstruction.
2. For parked vehicles blocking view -After initial field observations/measurements, either:
a. Coordinate with the adjacent property owners and restrict parking to provide the required
sight distance or,
b. Readjust the location of the stop bar (pavement marking) to be closer to the intersection.
3. For locations restricted by geometric conditions - After initial field observations/measurements,
options include:
a. Install advisory signs such as "HILL BLOCKS VIEW" "CURVE BLOCKS VIEW", "HIDDEN
DRIVEWAY', etc.,
b. Reduce roadway approach speed limits (after a comprehensive traffic study) or,
c. Install all-way STOP signs or traffic signals when adequate sight distance cannot be
achieved by any other means.
If you should have questions, please contact Douglas Wiersig, TPW Director, at 817-392-7801.
David Cooke
City Manager
ISSUED BY THE CITY MANAGER FORT WORTH, TEXAS