| GENERAL NOTES |
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| SUMMARY
OF XSF FLAGS |
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| XSF1 |
- Allows the late
introduction of P1 in AØ (Master). |
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| XSF2 |
- Allows the late
introduction of P2 in AØ (Master). |
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| XSF5 |
- Selects Special
Maximum for SGs 5 & 8 in CØ (Special Purpose Timesetting No.9) (All
modes). |
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| XSF6 |
- Selects Special
Maximum for SGs 6 & 7 in CØ (Special Purpose Timesetting No.10) (All
modes). |
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| SIGNAL
GROUP OPERATION |
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| Signal
Group 5 |
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| 1. SG5 is
controlled by Special Movement Timesetting No.1 in CØ. |
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| CØ All Red timesetting is substituted for
Special Movement Timesetting No.1. |
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| 2. XSF5 is used to
set the maximum extension green time for SG5 in CØ. |
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| This time is stored in Special Purpose
Timesetting No. 9. |
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| SG5 is forced off after this maximum
extension green time. |
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| Signal
Group 6 |
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| 1. SG6 is
controlled by Special Movement Timesetting No.2 in CØ. |
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| CØ All Red timesetting is substituted for
Special Movement Timesetting No.2. |
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| 2. XSF6 is used to
set the maximum extension green time for SG6 in CØ. |
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| This time is stored in Special Purpose
Timesetting No.10. |
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| SG6 is forced off after this maximum
extension green time. |
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| Signal
Group 7 |
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| 1. SG7 is
controlled by Special Movement Timesetting No.3 in CØ. |
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| CØ All Red timesetting is substituted for
Special Movement Timesetting No.3. |
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| 2. XSF6 is used to
set the maximum extension green time for SG7 in CØ. |
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| This time is stored in Special Purpose
Timesetting No. 10. |
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| SG7 is forced off after this maximum
extension green time. |
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| 3. Late start SG7
in CØ if going BØ®CØ. |
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| Signal
Group 8 |
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| 1. SG8 is
controlled by Special Movement Timesetting No.4 in CØ. |
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| CØ All Red timesetting is substituted for
Special Movement Timesetting No.4. |
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| 2. XSF5 is used to
set the maximum extension green time for SG8 in CØ. |
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| This time is stored in Special Purpose
Timesetting No. 9. |
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| SG8 is forced off after this maximum
extension green time. |
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| 3. Late start SG8
in CØ if going BØ®CØ. |
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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 anytime in C2Ø and at the start of AØ and can overlap C2Ø ®AØ |
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| In
Master P1 can introduce at any time in AØ while XSF1 is set. |
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| Pedestrian 2 |
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| P2
calls AØ. |
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| P2
can introduce at anytime in C3Ø and at the start of AØ and can overlap C3Ø ®AØ |
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| In
Master P2 can introduce at any time in AØ while XSF2 is set. |
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| Late
start P2 in AØ if going C1Ø or C2Ø®AØ using a special timer (CØ special all red) that starts at
the end of SG5 yellow. |
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| Late
start P2 in CØ if going C1Ø®C3Ø
using a special timer (CØ special all red) that starts at the end of SG5
yellow. |
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| Pedestrian 3 |
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| P3
calls BØ. |
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| P3
can introduce at the start of BØ. |
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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 3 |
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| Clear
demands for CØ from detector 3 during SG5 green and yellow. |
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| Detector 7 |
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| Clear
demands for CØ from detector 7 during SG6 green and yellow. |
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| OPERATION
OF PREPARE TO STOP SIGNS |
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| Relay
Output 1 (P4 Wait State/SO1) drives a “Prepare to Stop/Blank” sign located
120 metres to the west of the intersection. (Note: BLANK refers to sign
showing no display). |
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| 1. Relay Output 1
(P4 Wait State/SO1) is to be switched on at the start of AØ ECO if going AØ ® BØ, AØ®C1Ø or AØ®C2Ø. |
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| 2. Relay Output 1
(P4 Wait State/SO1) remains on until one of the following conditions is met: |
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| · Timer 1 (refer Special Purpose Timesetting no. 11)
expires. Timer 1 starts timing at the
start of SG2 green. (Note: Timer 1 should be equal to or less than AØ minimum
green.) |
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| · Detectors 4, 5 and 6 become unoccupied for duration of Timer 2
(refer Special Purpose Timesetting no. 12) (gap time) during SG2 green. |
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| CALCULATION
OF AØ ECO |
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| AØ ECO = |
time to travel from the
“Prepare to Stop” sign to the stop line (north approach) |
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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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= (120 m / 19.4 ms-1) - 4.5 s (AØ yellow) + 1.5 s |
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= 6.2 - 4.5 + 1.5 s |
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= 3.2 s
(ECO set to 4.0 s) |
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| NOTE: if ECO were set at 3.5 s then motorists just missing the
start of the flashing “Prepare to Stop” sign could still be faced with 2.7 s
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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