[Talk-us-massachusetts] Interstate 290 and dual mile markers for 395?

[Greg Troxel]

Someone pointed out that on I-290, all the way to 495, there are in many
places dual mile markers, that given the same value, labeled as being
for I-290 and I-395.  Someone else said they have seen these also.  I
said I knew road nerds and would ask.

For background, 395 starts at the CT line and turns into 290 at I-90.
There are 290 ends/395 begin signs etc.  While placing that breakpoint
at the meter level is hard, it's clearly about there.  OSM has seemed
correct.

Were I in charge I would have used a single MM numbering from the CT
line to 495; especially near 90 people are not quite sure which road
they are on.  Indeed, that is how the exits are numbered.

But, I don't get why it makes any sense to consider 290 NE of the pike
to be in any way actually be 395.

Any insight?

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