Thousands are in Duluth today for Grandma’s Marathon and the Scenic North Shore Drive is closed up to Two Harbors for the race. MN-DOT’s Kevin Gutknecht also urges drivers to use extra caution on I-35, which is one lane each way between Pine City and Hinckley due to construction. He says, “On the weekends the work zones may not have people in them, but work zones are still a challenge for drivers.” Gutknecht says motorists need to use extra caution in work zones wherever they encounter them around the state.