The final leg of Interstate 69 from Martinsville to Indianapolis will cost nearly $1.6 billion.ThatÂ’s according to the Final Environmental Impact Statement for I-69 Section 6 the state released Thursday. The analysis says construction could start in 2020 and wrap up within six years.Section 6 will run along the existing route of State Road 37. That means some of the many businesses that line the highway in Morgan, Johnson and Marion counties will have to move.The FEIS says more than 80 businesses, including a non-profit and fire station, will need to relocate. ThatÂ’s in addition to nearly 200 residences that...