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Massachusetts milepost exit numbering conversion contract

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roadman:
Adoption of milepost-based exit numbers in Massachusetts has been discussed as a sidebar in other topics pertaining to Massachusetts.  Because MassDOT has recently let a contract for the conversion process out for bids, I feel that further discussion of this topic deserves a dedicated thread.  As such, I'll start by cross-posting a comment I left on the Massachusetts thread earlier:

Specifications and detail sheets for the MassDOT statewide milepost exit numbering conversion project have just been posted on the Commonwealth of Massachusetts bidding site (as of Tuesday, October 27th):

https://www.commbuys.com/bso/external/bidDetail.sdo?docId=BD-16-1030-0H100-0H002-00000005477&external=true&parentUrl=bid

Bid opening is scheduled for Tuesday, November 17, 2015.

AMLNet49:
Some interesting notes from reviewing the contract:

• Massachusetts treating US-3 and MA-3 as the same route will actually have a tangible effect now, as both the expressway on the south shore and the expressway near lowell follow the same exit numbering system, beginning at 1 in Plymouth and proceeding to 91 near the New Hampshire border.

• The newly numbered Exit 50 on MA-2 near Concord is not included in the exit renumbering contract. This could potentially be problematic if one exit is not on the same numbering system as the rest of the road.

• The previously unnumbered exits on the freeway portions of MA-28 and MA-57 will now be numbered. All freeways that are part of a larger route (including US-6) will be numbered according to the overall length of the route, not the freeway.

• Another US-6 note: the Orleans rotary, which was numbered as Exit 13 N/S until two rounds of replacements ago, will remain unnumbered in the new contract (would have been Exits 90 A/B), as will the interchanges in Truro and Provincetown.

• The MA-128 freeway (after breaking from I-95 in Peabody) will be numbered according to the distance from the southern terminus in Canton. However, since I-95 will be numbered according to distance from the Rhode Island state line, the exits will appear to randomly start at Exit 37 and count up. Also no exits beyond the present Exit 12 will be numbered. Currently Grant Circle is assigned as Exit 11, and the at-grade intersections with MA-127 and MA-127A are assigned Exits 10 and 9. However, none of these three exit numbers are posted in the field under the current signing contract.

• Massachusetts has chosen to not fudge numbers to avoid Exit 0, they will instead be liberally adopting Exit 0, which comes as a surprise to me given their history of assigning the end of a road as Exit 1 under the sequential system. There will be many Exit 0s under the new contract.

• I-290 will finally have its own set of exit numbers, beginning with Exit 0 at I-90/I-395, instead of just using I-395's number set.

• Massachusetts will not be keeping numbers where the mile is only 1 number off from the sequential number. They will be renumbering everything except when the mile and the sequential number are an exact match.

• For suffixed exits, Massachusetts will place a space between the number and letter (34 B instead of 34B). This is a practice that started in the last several years and was first used on MA-24 when Exit 8B (labeled as 8 B) opened. It will be expanded to all suffixed exits. However the "formerly Exit XX" signs will reference the old exit without a space if it did not previously have one.

• The Mass Turnpike from the Allston/Brighton tolls east will be renumbered under this project.

• For some reason, Interstate 93 from current Exit 6 to current Exit 12 and is not included under this contract. Perhaps these numbers will be changed under a sign replacement deal like the Mass Turnpike.

• All of the signs in the Tip O'Neill tunnel are not included under this contract, however signs outside the tunnel for exits contained within it are included.

• Exits along the freeway portions of US-44, US-1, MA-1A and MA-99 will not receive exit numbering under this contract.

• Exits along the super-2 portions of US-44 and MA-88 will not receive exit numbering under this contract.

PHLBOS:
Having thumbed through the documents (and given a heads-up on a FB post); MA will indeed be using Exit 0, but it's not consistently applied.

I-93's current Exits 1 through 5 will be future 0 through 4; personally, I would've left such alone (and saved some money)... especially since there's no changes for subsequent Exits 6 through 12.  Not to mention the very recent exit tab changes (from Exit 1 to Exits 1B-A) for the I-95 interchange in Canton.

However, I-95 current Exit 1 (partial-interchange w/US 1) at the RI State line will not become Exit 0 but current Exit 2A-B (MA 1A cloverleaf) will become Exit 1A-B.  Isn't having Exit X along with XA, XB no longer kosher with MUTCD/FHWA?

Further north, the Exit 23-24-25 (Recreation Rd./MA 30/I-90) will become Exit 39A-B-C respectively; however, MassDOT is repeating the same mistake it did when it renumbered this stretch some 27-28 years ago.  That mistake being they seem to be still numbering with respect to the southbound order of the ramps rather than the order of the actual roadway crossings. 

With MM-based exit numbering; the exit/interchange number is generally based on where the connecting road crosses the mainline corridor (in this case, I-95) not necessarily the location of the exit ramp(s).  In short, I-90 crosses I-95 south of MA 30; and the northbound ramp order reflects such (the southbound exit ramps do not).  That said, I-90 (current Exit 25/old Exit 50) should be new Exit 39B and MA 30 (current Exit 24/old Exit 51) should be Exit 39C; not the other way around.

The Lowell Connector's numbers will indeed change as well.  No application of Exit 0 here but there will now be Exits 1A-B-C-D-E-F with current Exits 5A-B-C becoming Exits 2A-B-C.

Now the big question: will there be addendums and/or change orders? 

When PA converted its exit numbers, the original plan was to have I-476's Exit 31 (NE Extension Lansdale interchange) become Exit 30 and I-95's Exits 1 though 3 were planned to be renumbered 0 through 2; but those particular changes did not happen.


--- Quote from: AMLNet49 on October 28, 2015, 07:36:08 PM --- For suffixed exits, Massachusetts will place a space between the number and letter (34 B instead of 34B). This is a practice that started in the last several years and was first used on MA-24 when Exit 8B (labeled as 8 B) opened.
--- End quote ---
That's actually the MUTCD standard that's been around for a while and that MassDOT started recently adopting (as you mentioned).  The spacing is to avoid Exit XB being mistaken for Exit X8 at a quick glance.

SidS1045:
One thing I didn't see in the project specs (might have missed it, of course):  How long does MassDOT expect the "FORMERLY EXIT XX" signs to be left standing?

bob7374:

--- Quote from: PHLBOS on October 28, 2015, 07:36:36 PM ---Having thumbed through the documents (and given a heads-up on a FB post); MA will indeed be using Exit 0, but it's not consistently applied.

I-93's current Exits 1 through 5 will be future 0 through 4; personally, I would've left such alone (and saved some money)... especially since there's no changes for subsequent Exits 6 through 12.  Not to mention the very recent exit tab changes (from Exit 1 to Exits 1B-A) for the I-95 interchange in Canton.

However, I-95 current Exit 1 (partial-interchange w/US 1) at the RI State line will not become Exit 0 but current Exit 2A-B (MA 1A cloverleaf) will become Exit 1A-B.  Isn't having Exit X along with XA, XB no longer kosher with MUTCD/FHWA?

Further north, the Exit 23-24-25 (Recreation Rd./MA 30/I-90) will become Exit 39A-B-C respectively; however, MassDOT is repeating the same mistake it did when it renumbered this stretch some 27-28 years ago.  That mistake being they seem to be still numbering with respect to the southbound order of the ramps rather than the order of the actual roadway crossings. 

With MM-based exit numbering; the exit/interchange number is generally based on where the connecting road crosses the mainline corridor (in this case, I-95) not necessarily the location of the exit ramp(s).  In short, I-90 crosses I-95 south of MA 30; and the northbound ramp order reflects such (the southbound exit ramps do not).  That said, I-90 (current Exit 25/old Exit 50) should be new Exit 39B and MA 30 (current Exit 24/old Exit 51) should be Exit 39C; not the other way around.

The Lowell Connector's numbers will indeed change as well.  No application of Exit 0 here but there will now be Exits 1A-B-C-D-E-F with current Exits 5A-B-C becoming Exits 2A-B-C.

Now the big question: will there be addendums and/or change orders? 

When PA converted its exit numbers, the original plan was to have I-476's Exit 31 (NE Extension Lansdale interchange) become Exit 30 and I-95's Exits 1 though 3 were planned to be renumbered 0 through 2; but those particular changes did not happen.


--- Quote from: AMLNet49 on October 28, 2015, 07:36:08 PM --- For suffixed exits, Massachusetts will place a space between the number and letter (34 B instead of 34B). This is a practice that started in the last several years and was first used on MA-24 when Exit 8B (labeled as 8 B) opened.
--- End quote ---
That's actually the MUTCD standard that's been around for a while and that MassDOT started recently adopting (as you mentioned).  The spacing is to avoid Exit XB being mistaken for Exit X8 at a quick glance.

--- End quote ---
I agree with much of what was said. Seems MassDOT is making things a little more complicated number-wise than need be. For example I-95 near I-93 in Reading. Heading northbound the current two exits before I-93 northbound are 35 and 36 with I-93 being 37A/B. They want to renumber these as 53, 55A and 55B/C. Wouldn't 53, 54, 55A/B be less confusing? At the top end of MA 3 the last three exits northbound are 17, 19 and 20A/B. Southbound there's a combined ramp for Exits 19/18, then 17. MassDOT wants the numbers NB to be 40, 42A and 42B/C, SB it lists the combined ramp as 42A/41 (why the suffix SB?). Wouldn't it be easier to combine 18 and 19 as 41B and 41A, making NB 41, then 42A/B?

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