controller 4017 counter LEDs have multiple connections in this traffic light circuit

  
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Why are four legs connected to the green LED and two to the amber LED in the 4017 traffic light circuit Shouldn`t it be able to do with only one leg per LED Each output is consecutively active for the same time. By wired-OR-ing outputs you can create longer active times. So the green LED will be on during 4 time units. Normally you would have to
controller 4017 counter LEDs have multiple connections in this traffic light circuit - schematic

wired-OR Q0 through Q4 for the red LED, but we have a carry output (here called ":10") which does just that, see the bottom trace of the timing diagram:



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