A plan to reduce traffic congestion and increase safety at Interstate 93’s exit 46 in Methuen is scheduled to come to fruition next fall, when the rotary will be replaced with a cloverleaf interchange and several new access ramps. According to the Merrimack Valley Planning Commission, the project design is complete; the next step is to put it out to bid this spring. It's estimated the project will take three years or more to complete at a cost of $60 million,  of which 80 percent be paid through federal funds and 20 percent the state. The area, in which I-93 meets routes 110 and 113,  has one of the highest accident rates in the valley.