HomeMy WebLinkAboutRPT 3 NO U-TURN SIGN 11-19-90! - I `f -CI
DATE: NOVEMBER 14, 1990
TO: WILLIAM A. HUSTON, CITY MANAGER
REPORT NO. 3
11-19-90
Inter - Com
FROM: PUBLIC WORKS DEPARTMENT/ENGINEERING DIVISION
SUBJECT: ADDITIONAL INVESTIGATION ON REMOVAL OF "NO U TURN" RESTRICTION
FOR NORTHBOUND TUSTIN RANCH ROAD AT IRVINE BOULEVARD.
Recommendation:
Receive and file.
Background:
The City Council, at their meeting of November 5, 1990 requested
staff to further investigate removing "No U -Turn" restriction on
Tustin Ranch Road at Irvine Boulevard. Councilman Potts requested
that we review signage used at the similar intersection of
Michelson and Culver in the City of Irvine.
Staff reviewed the Michelson/Culver intersection and the "Watch
U -Turning Vehicle" sign used at that intersection. However, the
two intersections differ in the operation of the traffic signals.
The Michelson/Culver signal uses split phasing and does not provide
a right turn green arrow on the side street. Where as the Tustin
Ranch Road/Irvine Boulevard traffic signal uses separate left turn
phasing and does provide a green right turn arrow for the Irvine
Boulevard.
The Tustin intersection can not use the "Watch U -Turning Vehicle"
sign when the right turn overlap green arrow is being used. To
install the forementioned sign at the Tustin Ranch Road/Irvine
Boulevard intersection would require the removal of the right turn
overlap arrow. This would greatly reduce the right turning lane
capacity on Irvine Boulevard and will cause considerable back up on
Irvine Boulevard as soon as the Tustin Ranch interchange is
completed and the right turn demand increases.
The traffic signal at Tustin Ranch Road and Irvine Boulevard has
been designed to accommodate the freeway interchange traffic as
well as the anticipated growth in the Tustin Ranch area.
The removal of the "No U -Turn" restriction and the right turn
overlap signal would have only a minor impact currently, but in the
future will have adverse effects.
Discussion:
The Tustin Ranch Road Over -crossing at the Santa Ana Freeway
scheduled completion dates are as follows:
March 1, 1991 - Freeway northbound off -ramp and southbound on-ramp
to be completed.
October, 1992 - Northbound on-ramp and southbound off -ramp to be
completed.
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Bob Ledendecker Sandra Doubleday
Director of Public Works/City Engineer Engineering Consultan
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