Sunkwang sell some cool submergable day night cameras that may do the trick for you, or you could go for the Ganz IP67 cameras that can be sprayed with a hose, Sunkwang also make a cool and cheap day night cam with full onscreen configuration, it is on my website if you want to take a look.
www.altechvision.com you could use the counter application in Geo to count the cars, Version 6.1 also allows you make alarms if traffic goes the wrong way as well... car in reverse for example.
6.1 really rocks, way too much in it though, I just got the Infa Red controller the other day. No more Keyboard! and no more big menus!