So in looking around in eBay for 555 timer modules, I came across this $1.27 (free shipping) module that has a 555 and 4017 in the same configuration as the Traffic Signal controller and the Knight Rider circuit. Yes, you'd have to be handy with the soldering iron to modify the 10 outputs with the diodes and actual LEDs but it may be a way to save some time wiring up the 555 and 4017 portion of the circuit. It probably runs fast for a traffic signal so the 1uF capacitor C1 would need to be increased. Just a thought.
http://www.ebay.com/itm/New-NE...;hash=item4ad99b4138
One more thing on the 555. Usually, if pin 7 (Discharge) is used for a basic oscillator, then the 500K pot goes to pin 8 (Vcc) rather than to pin 3 (output). But there are zillions of ways to hook up the 555 - but I'd double-check that connection.
