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GENERAL NOTES |
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SUMMARY OF MSS FLAGS |
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MSS8 |
- While Relay Output is
on, set MSS8. |
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GENERAL OPERATION |
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1. |
If in Cf clear demands for Bf. |
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2. |
Use CØ yellow if going
BØ ® AØ. |
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SIGNAL GROUP OPERATION |
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Signal Group 8 |
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1. |
SG8 operates
green-yellow-red in Bf. |
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2. |
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SG8 goes red with SG4 in
Cf, and remains red through
Af. |
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3. |
SG8 closes down at the
start of Bf all red period,
remains red through Cf
late start, then goes ‘blank’ at the start of Cf minimum green. |
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When P3 is demanded. |
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4.
If going Af®Cf,
with a demand for P3, hold SG8 red for the duration of Timer 1 (Special
Purpose Timesetting No.9). Timer 1 starts timing at the start of P3 walk.
When Timer 1 expires SG8 red is switched off. |
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5. |
If going Bf®Cf, with a demand for P3, SG8 goes red at the start of Bf all red period, and is held red
for the duration of Timer 1 (Special Purpose Timesetting No.9). Timer 1
starts timing at the start of P3 Walk. When Timer 1 expires SG8 red is
switched off. |
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6. |
Cf ECO is used to guarantee SG8 minimum blank period. Timer 2
(Special Purpose Timesetting No.10) starts timing at the start of SG8 blank
period. When Timer 2 expires, expire Cf ECO. |
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PEDESTRIAN GROUP
OPERATION |
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Pedestrian 1 |
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P1 calls AØ. |
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P1 can introduce at the
start of AØ. |
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Pedestrian 2 |
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P2 calls AØ. |
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P2 can introduce at the
start of AØ. |
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Pedestrian 3 |
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P3 calls CØ. |
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P3 can introduce at the
start of CØ. |
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DETECTOR OPERATION |
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General |
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Clear vehicle demands
during associated phase green and yellow. |
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Detector 10 |
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Detector 10 places a
locking call for CØ and extends BØ and CØ. |
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Clear demands for CØ
from detector 10 during SG4 green and yellow in BØ and CØ. |
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Detector 11 |
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Detector 11 places a
non-locking call for BØ when its presence time expires and extends BØ. |
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Detector 11 places a
locking call for CØ and extends CØ. |
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Clear demands for BØ
from detector 11 during SG8 green and yellow. |
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Clear demands for CØ
from detector 11 during SG4 green and yellow in BØ and CØ. |
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OPERATION OF PREPARE TO
STOP SIGN |
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Relay output drives the
flashing “Prepare to Stop” sign (located 100 metres north of the
intersection). |
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Relay output is switched
on |
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- at the start of Af ECO, if going Af®Bf or Af®Cf, and remains on until one of the
following condition is first met: |
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1. |
Timer 3 (refer Special
Purpose Timesetting No.11) expires. Timer 3 starts timing at the start of SG2
green. (Note: Timer 3 should be equal to or less than Af minimum green.) |
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2. |
Detectors 5, 6 & 7
become unoccupied for the duration of Timer 4 (refer Special Purpose
Timesetting No.12) (gap time) during the north approach through green. |
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Relay output is
activated by P4 Wait State (ATSC4) or Special Output 1 (Eclipse). Both P4 Wait State and Special Output 1 are
set in the controller personality. |
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Calculation of ECO |
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Af ECO = |
time to travel from the
“Prepare to Stop” sign to the stop line |
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- time to travel from
the nominal stopping distance to the stop line (phase yellow) |
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+ reaction time
(including the time to travel the viewing distance) |
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= (100 m / 16.7 m.sec-1) – 4.0 (Af yellow) + 1.5 |
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= 6.0 – 4.0 + 1.5 |
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= 3.5 secs (ECO set to 4.0 secs) |
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NOTE: if ECO set at 3.5
secs then motorists just missing the start of the flashing “Prepare to Stop”
sign could still be faced with 2.5 secs of yellow. As a rule of thumb, to
avoid confusion/indecision, ECO should be set such that motorists in the
above situation are faced with less than half the phase yellow. |
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MSS8 is set, while SO1
is on. |
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