Skeeter, great find on those light housings. Based on your PM, i feel these might be worth a look for driver circuits if you're not needing as amazing as the full-function customized micro controller setup like TaltosVT is building.
http://galakelectronics.com/timers.htm
Specifically i really like the looks of this one, which i saw on several other sites (ebay, etsy... heh, glad the designers url is silkscreen on the pcb) with diagrams of the timing sequences it can run.
http://galakelectronics.com/VG-303.htm
How likely do you think RC guys at a worksite or meet are actually going to be obeying your traffic controls VS the lights across road being more of a trip hazard?
I think you're just looking to give your rc Police car something to do...