Saginaw, and Livonia (suburban Detroit). My dad had relatives, including a half-sister, in Windsor so we usually visited a couple of times a year. Generally used the bridge or tunnel at Detroit/Windsor, but went through Port Huron/Sarnia a couple times. Also (on vacation) several times at the Soo, and twice at Grand Portage Minn. I don't think we EVER waited more than 15 - 20 minutes, they'd usually only check 1 or 2 ID's in the car, ask a couple questions and be on your way. Now I hear that 30 minutes is "normal" and it takes a file-cabinet full of papers.