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HomeMy WebLinkAboutRPT 2 TRAF SIG OPER. 11-21-83 - 11-21-83- ~T£ EMBER 14, 1983 lnter-¢on S UBJ ECT: WILLIA~t HUSTON, CITY MANAGER BOB LEDENDECKER,'DIRECTOR OF PUBLIC WORKS/CITY ENGINEER IRVINE BLVD. TRAFFIC SIGNAL OPERATION (INFORMATIONAL REPORT) At their November 7th meeting, the City Council requested staff to review the left turn phasing of the traffic signal system along Irvine Blvd. Additionally, a similar concern was raised by a county resident on the left turn phasin§ at Irvine Blvd. and Holt Avenue. Staff reviewed each of the intersections on November 8th and 9th and found all of the left turn phasing cycles to be working as specifically designed. However, during this review three of the left turn mastarm signal beaus were turned downward as a result of the wind, which provided poor visibility of all of the phasing indications. A request was telephoned to Signal Maintenance Company, the City's contractor, to rectify these conditions on November 9th. The intersections and signal heads which were impacted by the wi.nd are as follows: 1. Newport Avenue, both eastbound and westbound directions of Irvine Blvd. 2. Red Hill Avenue, the eastbound direction of Irvine Blvd. As a result of a previous Council request, staff prepared an article explaining the operation of the traffic signal system along Irvine Blvd. for placement in the Tustin Today Newsletter. A copy of this article, which appeared in the Fall, 1983 issue, is attached for information. Bob Ledendecker Director of Public Works/City Engineer jr Attachment TUSTIN CITY COUNCIL RONALD B. HOESTEREY URSULA E. KENNEDY MAYOR MAYOR PRO TEM FRANK H. GREINKE COUNCILMAN RICHARD B. EDGAR DONALD J. SALTARELLI COUNCILMAN COUNCILMAN TUSTIN CITY COUNCIL "Tg~tin Today" and all the recreation and community services programs inside are brought to you by the Tustin City Council lhtough the Community Services Deparlmont. The Tustin City Council resets the f'u'sx and Ihltd Mondays of each month, 7:00 · p.m., in the Council Chambers, 300 Centennial Way. Public input i~.encunraged. Your City Council membe~ are: Mayor Ronald B. - Hoestemy, Mayor Pro Tern Ursula E. Kennedy, Councilman Donald J. Salta~lli, Councilman Richard B. Edgar, and Council- man Frank H. Greinke. CITY DIRECTORY Emergency: 91 I Pt)lice Department: Business: ?.~. 5424 Emergency: 544-5420 Fire Department: Fire or Rescue: 838-1313 City Office: $44-8890 IRVINE BLVD. TRAFFICSIGNAL OPERA- TION Since thc reonnt installation of the new ~raffic signal system along Irvine Blvd., there has been some confusion by motorists regarding Ibe left turn movements at lbe Yorba St., Prospect Ave., Holt Ave., Ne,w~.~-t Blvd., and Red Hill Ave. intersections. Hopefully, the following explanation of bow the left turn movements of this sigual system operates will be helpful in eliminating some of this confu- sion. 'rbe in,'rsecfiun of Newpo~ Ave. and b'vine Blvd. will be used as an example. The westbound L-vine Blvd. left turn lane contains four (4) regular detector loops as shown on the drawing, and one (I) qne kx~p. The westbound through phase is controlled by the regular de~cmrs in the number I and 2 lanes. The left turn phase is also cont~olled by the regular loop detectors and the qne loop. When vehicles fu~ stacked in the left torn lane and only over thc regular loop tnffic detectors, the "peen ball" will be actuated which permits a non-protected left mm. This is similar to any intersection without protected left turn movements, i.e. the intersection of First and Pacific Streets. If vehicles are stacked in the left turn lane over the regular loop detectors and also over the qne loop at thc termiun- fiun oftbe opposing street's green phase, the '*groen arrow" will be actuated which will provide a protected left turn while stopping all outbound through u'a~c on L-vine Blvd. On lrvine Blvd., the green mTOW will always appear at the beginning of the phase. This type of signal phasing is the most time efficient phasing and provides thc n~ximum &mount of green t~ne for the major street.