Before you start to read this, you can port the individual models from left 4 dead 1/2 or remake them I do have a legit copy but I am terrible with model paths ect.
Traffic Lights like these,
http://www.splorp.com/gif/daily.020912.jpg
http://www.treehugger.com/traffic-lights-sky-photo-0001.jpg
Highway Lights,
Highway signs, (Leave them blank so I can edit my locations in.)
A sign like this with a few skin variations I can edit.
Thanks