GENERAL NOTES
SUMMARY OF MSS FLAGS
MSS8 - While Relay Output is on, set MSS8.
GENERAL OPERATION
1. If in Cf clear demands for Bf.
2. Use CØ yellow if going BØ ® AØ.
SIGNAL GROUP OPERATION
Signal Group 8
1. SG8 operates green-yellow-red in Bf.
2. SG8 goes red with SG4 in Cf, and remains red through Af.
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.
When P3 is demanded.
4.             If going ACf, 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.
5. If going BCf, 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. 
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.
PEDESTRIAN GROUP OPERATION
Pedestrian 1
P1 calls AØ.
P1 can introduce at the start of AØ.
Pedestrian 2
P2 calls AØ.
P2 can introduce at the start of AØ.
Pedestrian 3
P3 calls CØ.
P3 can introduce at the start of CØ.
DETECTOR OPERATION
General
Clear vehicle demands during associated phase green and yellow.
Detector 10
Detector 10 places a locking call for CØ and extends BØ and CØ.
Clear demands for CØ from detector 10 during SG4 green and yellow in BØ and CØ.
Detector 11
Detector 11 places a non-locking call for BØ when its presence time expires and extends BØ.
Detector 11 places a locking call for CØ and extends CØ.
Clear demands for BØ from detector 11 during SG8 green and yellow.
Clear demands for CØ from detector 11 during SG4 green and yellow in BØ and CØ.
OPERATION OF PREPARE TO STOP SIGN
Relay output drives the flashing “Prepare to Stop” sign (located 100 metres north of the intersection).
Relay output is switched on
- at the start of Af ECO, if going ABf or ACf, and remains on until one of the following condition is first met:
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.)
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.
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.
Calculation of ECO
Af ECO  = time to travel from the “Prepare to Stop” sign to the stop line
- time to travel from the nominal stopping distance to the stop line (phase yellow)
+ reaction time (including the time to travel the viewing distance)
= (100 m / 16.7 m.sec-1) – 4.0 (Af yellow) + 1.5
= 6.0 – 4.0 + 1.5
= 3.5 secs (ECO set to 4.0 secs)
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.
MSS8 is set, while SO1 is on.