A buddy and I are taking a road trip from northern California up to Montana in July, and I was wondering if anyone knew what methods of speed detection are used in Nevada, Idaho and Montana, and how strongly enforced the roads listed below are. the main highways we are traveling on are I-80, US-93, I-84, I-86, I-15, US-20, and US-287. And does anyone know if they really enforce the speed limits in Montana? Thanks for the help!