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PRINCES HIGHWAY NR CAMPBELL STREET   SITE NO. 6616
OPERATION OF ADVANCE WARNING SIGNS
Special Purpose Output 1 (SPOP1) & Special Purpose Output 2 (SPOP2)
In order to operate the Advance Warning Signs by (SPOP1) & (SPOP2), the operation of 
SG1and SG2 is modified as described below:
SIGNAL GROUP 1
At the point where SG1 is free to close down (to introduce P1), SG1 is held for an 'extra time' 
(see Special Movement Time No.3) before going to Yellow. This extra time is used to activate the Advance 
Warning Signs (see notes on Operation of Advance Warning Signs below).
SPOP1 is on until SG1 goes green. 
SIGNAL GROUP2
At the point where SG2 is free to close down (to introduce P2), SG2 is held for an 'extra time' 
(see Special Movement Time No.4) before going to Yellow. This extra time is used to activate the Advance 
Warning Signs (see notes on Operation of Advance Warning Signs below)
SPOP2 is on until SG2 goes green. 
Wait State 7 (WS7)
● Drives the operation of two flashing "PREPARE TO STOP" signs on the west approach.
● The flashing "PREPARE TO STOP" signs will be activated from a point of view prior to SG1 closing down. 
   This time is calculated as follows:
Time = 
(Time to travel to Stop Line - Time to travel from nominal stopping distance to the Stop Line + Reaction Time)
Time = (230/22.22) - 4.5 (i.e. SG1 Yellow Time) + 1.5
Time = (230/22.22) - 4.5 (i.e. SG1 Yellow Time) + 1.5
Time =7 sec
Wait State 8 (WS8)
● Drives the operation of two flashing "PREPARE TO STOP" signs on the east approach.
● The flashing "PREPARE TO STOP" signs will be activated from a point of view prior to SG2 closing down. 
   This time is calculated as follows:
Time = 
(Time to travel to Stop Line - Time to travel from nominal stopping distance to the Stop Line + Reaction Time)
Time = (200/22.22) - 4.5 (i.e. SG2 Yellow Time) + 1.5
Time = (200/22.22) - 4.5 (i.e. SG2 Yellow Time) + 1.5
Time =6 sec