As you come off the Bridge you are on Huron Church Road. Follow this road for 5 or 6 miles and it directly turns into the 401. The 401 is the main highway through Chatham, London and Toronto ( My wife grew up in London and my in-laws still live there). If youve ever driven this highway you have seen that the traffic consists of at least 50% trucks at any given time. This is the main highway connecting the industrial centers of Chicago/Detroit/Toronto. The Ambassador Bridge is the busiest crossing between the two countries.

Shut down the Ambassador Bridge crossing and the Blue Water Bridge between Port Huron and Sarnia and you squeeze off a huge percentage of trade between the two countries. These are strategic crossings indeed.

There is still the tunnel crossing but that is for cars only I believe. Been a long time since I used the tunnel. It connects the downtown areas of Detroit and Windsor.