Crossing the Detroit River, Windsor
If you drive into Canada from the US you can either go over or under the Detroit River, I have gone over the Ambassador Bridge on previous trips and it is the more scenic of the two routes. You have to pay a toll, either in Canadian or US Currency (currently $4.75CDN or $4US, same as the tunnel), and pass through immigration/customs where they ask you a couple of questions and usually wave you through.
There is currently construction on the Ambassador Bridge which is why I took the tunnel on this trip. It is the busiest international border crossing in North America and repairs are much needed. I was surprised to recently read that the bridge is privately owned by a Michigan businessman, Manuel Moroun, and that the toll money goes into his pocket, not the Michigan or Ontario government's pockets. There is currently a battle going on as to who is going to build a new bridge to either replace or supplement the current bridge, will it be the government or will it be Moroun?
Due to construction on the Ambassador Bridge over the Detroit River we were advised to go under by using the Detroit/Windsor Tunnel to get from the US to Canada. We crossed at around 4pm on Friday evening and thought it would take forever but we only had to wait for one car. There is a toll to use the tunnel, it's currently $4US or $4.75CDN which is odd since the dollars on both sides are just about even right now. Going the other direction from Canada to the US it's $4US or $4.50CDN.
The Tunnell is the 2nd busiest crossing from the US to Canada behind the Ambassador Bridge which also goes from Detroit to Windsor. After you pass through immigration/customs, you will find yourself amidst a couple of blocks of duty free stores. The tunnel was closer to our hotel on Riverside Drive.
Going to Canada and Coming back to the USA the price of the toll is rather cheap in comparison to other tolls that I have paid when using highways in other large cities in the USA. Coming and going is $3.25 USD or $4 Canadian dollars.
The two primary ways to travel between Windsor, Ontario, and Detroit, Michigan, is either the Windsor-Detroit Tunnel or the Ambassador Bridge. Our preference is the bridge; the views are much better.
At the time the bridge opened, April 16, 1930, it's 1,850-foot-length spanning the Detroit River made it the longest suspension bridge in the world. Though now surpassed by longer and more famous bridges, It is still an impressive sight.
Toll for the bridge is $2.75 American or $4.00 Canadian. Expect a short delay for a security check at the border. For us it has taken anywhere from 5 to 25 minutes. A passport or proof of citizenship may be required.