HomeMy WebLinkAboutRPT 2 LEFT TURN ARROWS 6-6-83/~ DAT£ MAY ~, Inter-Corn
FROI, I:
SUBJECT:
WILLIAM HUS~ON, CITY MANAGER
BOB LEDENDEiCKER, DIRECTOR OF PUBLIC WORKS/CITY ENGINEER
IRVINE BbVDi'./NEWPORT AVE. LEFT TURN ARROWS
INFORMATION! REPORT'
A concern was raiseid at the last City Council meeting as to the
left turn operationl of the traffic signal.at Irvine Blvd. and
Newport Ave. This isignal has been checked by staff and has been
found in good worki.lng order.
Perhaps a brief explanation of how the'traffic signal phasing
operates might be hjelpful in eliminating some of the confusion.
The westbound Irvi~e Blvd. left turn lane contains four (4)
regular detector loops as shown on the attached sketch, and one
(1) que loop. The westbound phase is controlled by the regular
detectors in the n mber 1 and 2 lanes. The left turn phase is
also controlled by the'fegular loop detectors and the que loop.
When vehicles are tacked in the left turn lane and only over the
regular loop traff'c detectors, the "green ball" will be actuated
which permits a nor-protected left turn. This is similar to any
intersection witho.t protected left turn movements, i.e. the
intersection of Fi
stacked in the left
also over the que 1
will provide a prot
through traffic on
appear at the end
.st and Pacific Streets. If'vehicles are
turn lane over the regular loop detectors and
oop, the "green arrow" will be actuated which
;ected left turn while stopping all eastbound
Irvine Blvd. This "green arrow" will usually
,f the phase.
This type of signa
and provides the m
street. All signa)s along Irvine Blvd. between Yorba St. a
Hill Avenue operate in this manner.
phasing is the most time efficient phasing
ximum amount of green time for the major
d Red
BOB LEDENDECKER
DIRECTOR OF PUBLIC WORKS/
CITY ENGINEER
db
Attachment
i,,.
INDICATES
VEHICULAR
BCR -- - ECR
ECRj~~UREI RETUR~ BCR
(TYPICAL) I
ECR --
)IRECTION OF
TRAVEL
j__j/ (~UANTITY, 8)
I
QUE LOOP
.ADVANCE TRAFFIC DETECTOR
(ONE PER LANE)