I am from Minneapolis. There is no traffic jams except those caused by construction. I lived along Hwy 100 north of Duluth street. You can walk across that highway most times of the day as traffic is light. The similar highways here in the San Fernando valley in California on the other hand are crowded. Buses would be cheaper in Minneapolis that can change routes anytime then a train that is stuck on rails.
Traffic cams
http://www.dot.state.mn.us/tmc/trafficinfo/cameras_map.html
people hate riding buses, too