What are Montana's busiest highways?

It's the time of year when it seems like everybody and their dog is hitting the road for summer trips, so we thought we'd take a look at which stretches of Montana highway rank as the busiest.

As it turns out, according to data from the Montana Department of Transportation, the state's highway hot spots tend to cluster around urban areas. A stretch of King Avenue West in Billings just north of Interstate 90 has the dubious distinction of being the busiest road in the state, with about 40,000 vehicle trips a day. Other busy spots include the city's Main Street as it heads into Billings Heights...