On an average morning's commute on I-35W, it's not unusual for cars to be backed up in both general-purpose lanes, because of congestion, an accident or poor road conditions.
Meanwhile, traffic in the MnPass lane — the far left lane, marked with a diamond and reserved for buses, carpoolers and those paying a toll to use it — is typically moving swiftly.
The difference is enough to make even law-abiding drivers consider sneaking over for a bit. And if you've ever wondered what would happen if you did, you're not alone.
"We certainly do get a lot of questions about law enforcement out there," said Brian Kary, freeway operations engineer for the Minnesota Department of Transportation.
Since the MnPass lane on I-35W began operating in 2009, MnDOT has contracted with the State Patrol to have two troopers dedicated to policing it during rush-hour periods, said patrol spokesman Eric Roeske.
One trooper is stationed in the south and another on the north end of the MnPass stretch, which begins in downtown Minneapolis and ends just south of County Road 42 in Burnsville, Kary said.
The troopers "won't ignore other violations … but we're primarily there to enforce the MnPass lane," Roeske said.
Using a mobile reader in their squad cars, troopers can identify vehicles in the lane that don't have a MnPass transponder. Then they look for whether the drivers have another passenger with them. If they don't, they may be pulled over, Kary said.