Interstate 380 through and north of town and from CR to Iowa City
Most of the time you can get away with going 5-10 miles over what’s posted but occasionaly there will be MAJOR speed traps. They are especially common around the exits near H Ave. and 29th/32nd Street exits. South of downtown you should be careful between Hwy 30 and Wilson. It’s also common for them to downtown on 380 under the 7th Street bridge.