This is legit traffic engineering regardless of Vox being the source. A quick Google search will yield dozens of reputable results. Regardless, the OP's assertion that this applies to Massachusetts is wrong. There has not been any expansion of the interstate system here in 40 years.

This is not true. Other than adding capacity for safety and transit, like bus-only and HOV lanes, there has not been a meaningful increase in roadway capacity in more than 40 years.

Massachusetts is not adding any new roadways and hasn't for more than 40 years. The last time a new interstate was built was in the early 1980's when I-190 (Leominster to Worcester) was completed and the remaining spur of I-495 to the cape was completed.

The only roadway changes that have been made since then were modifications of existing roadways with capacity changes for safety or evacuation route purposes - like the big dig.

This works the same everywhere - regardless of what state you're in. Falls on your property, you own it. If it causes damage your insurance company takes care of it and subrogates with other parties if needed. Done.