Traffic light circuit
It looks like you have the Reset pin (pin 15) of the 4017 not connected to anything.  It could be floating high (reset), low, or somewhere in between.  You should connect it to ground.  Or, perhaps you want to connect this reset to some signal that will reset / synchronize your counter when idle?  As it stands, your the counter will start and stop at fairly random count states.

And why are your first few counter outputs not driving the LED circuits?  I thought a traffic light needed to always have one light illuminated.

Also, the 4017 outputs may not provide enough current to light your LEDs.  It looks like these pins can only source a couple of mA, and driving these LEDs and diodes without any series resistance may overload the outputs.  Consider using buffer transistors to drive the LEDs.