There are two high-occupancy toll (HOT) express lanes at the center of the road. Prior to May 16, 2005, they had been traditional high-occupancy vehicle (HOV, or carpool) lanes, allowing buses, motorcycles and vehicles with two or more occupants to use them during rush hour periods, while single-occupancy vehicles were not permitted. Now, drivers riding alone can use the lanes at any time, but must have a MnPASS electronic toll collection transponder in order to pay for using the express portions.