This is Part 4 of a series about Destination 2040, the Boston Region Metropolitan Planning Organization’s (MPO) new Long-Range Transportation Plan (LRTP). Destination 2040 establishes a vision for the region’s transportation system and funds both capital investments and research studies to support that vision. Parts 1, 2, and 3 of this series presented different stages of the new plan’s development, prior to its endorsement in August 2019. This installment explores how the new plan is being put into action.