Highway speed camera's

Speed camera on Highways? Does anyone know of things like these? I am planning a to go on a road trip from my college to Vail CO for winter break, and i want tro beef up my system alittle if needed

illinois has a few of them in construction zones

colorado, nebraska, iowa, ohio, and indiana do not... not sure about the other states you will go through

there is many in ohio , also DC, and Arizona. Soon Texas .

We also expect that sooner or later many cities with red light cameras will turn the speed camera option on.