State officials report Massachusetts will start joining the rest of the country late next summer with a program that will renumber highway exits from the current sequential system to one based on mileage.
The readjustment will start in the western part of the state and head east, until finally there are no more exits to renumber. The current exit numbers will then stay up alongside the old ones for at least two years.
The federal government, which wants the exit numbers changed, will pick up 90% of the cost. The state had initially planned to start the renumbering in 2015.
Map showing the new exit numbers.