On 61, the speed limit rapidly decreases from 65 to 55, 45, and 35 as you enter town from north. Every traffic signal has a red light camera. As you go through town, the limit changes to 45, 55, back to 45, 55 again, and 65 as you exit. Every time I go through Hannibal, I see at least one cop. Also, on US 36 and I 72, the speed limit goes to 55 for no reason as it is a limited access road. There are always cops patrolling. Be very careful or just bypass town.