thumb|right|The Mendota Bridge over the Minnesota River between Fort Snelling and Mendota In the 20th century, the Twin Cities area expanded outward significantly. Automobiles made it possible for suburbs to grow greatly. The area now has a number of freeways, and many traffic cameras and ramp meters to monitor and manage traffic congestion. There is some use of HOV (high-occupancy vehicle) express lanes, which is becoming more common. To use an express lane, a driver must have a MnPASS transponder or at least one passenger. MnPASS rates are determined by the amount of traffic on the road and/or the time of day. During non-peak times, the MnPASS express lanes, except those on Interstate 394 (I-394) between Minnesota Highway 100 (MN 100) and I-94, are open to all traffic.
thumb|right|The Mendota Bridge over the Minnesota River between Fort Snelling and Mendota In the 20th century, the Twin Cities area expanded outward significantly. Automobiles made it possible for suburbs to grow greatly. The area now has a number of freeways, and many traffic cameras and ramp meters to monitor and manage traffic congestion. There, is some use of HOV (high-occupancy vehicle) express lanes, which is becoming more common. To use an express lane, a driver must have a MnPASS transponder or at least one passenger. MnPASS rates are determined by the amount of traffic on the road and/or the time of day. During non-peak times, the MnPASS express lanes, except those on Interstate 394 (I-394) between Minnesota Highway 100 (MN 100) and I-94 are open to all traffic.