Interstate 94 is the only east-west interstate to form a direct connection into Canada (no such interstate ends at the Mexican border). At Port Huron, I-94 crosses the Blue Water Bridge into Sarnia, Ontario and becomes Highway 402, which can be used by motorists going to Toronto.
Interstate 494 was originally planned to serve as a loop in Chicago and follow Lake Shore Drive along Lake Michigan. After local opposition prevented I-494 from being completed, the number was completely dropped. Portions of the old I-494 exist as US 41/Lake Shore Drive.
The I-494/I-694 loop in the Twin Cities has a speed limit of 60 mph (95 km/h) in most places. All highways within the loop are 55 mph (90 km/h), and Minnesota highways outside the loop can go up to 65 mph (100 km/h); 70 mph (110 km/h) if they are Interstate highways.
40 miles (64 km) north of the Twin Cities near Otsego, the Minnesota Department of Transportation (Mn/DOT) operates the Mn/ROAD research facility, which studies the effect of traffic on various road surface types. Westbound traffic is redirected onto 3.5 miles (5.5 km) of pavement outfitted with thousands of sensors. There is a straight-through bypass (the original highway) that can be used when researchers are examining the road up close.
Recent news
As of 2005; I-94 is undergoing rehabilitation in and around the Detroit area according to MDOT.