They use this scheme in SOME places, but not everywhere.
Massachusetts has been changing the highway exit numbers for the last decade or
slow to adopt the scheme where the exit numbers are the number of miles from one
end of the highway. So you know that if you are at exit 68 and want exit 72,
its another 4 miles (or you missed it 4 miles ago.) But you don't know how many
exits there are before you get to it, and you don't know if you should move to
the right lane now, or wait until you've passed exit 71.
Another bad feature of this numbering scheme (but maybe was a matter of poor
choices rather than a necessary feature) is that instead of the exits being
numbered, for example, 17E and 17W for exits to an East-West road when you are
on a North-South road, they are labeled 68A and 68B. If you know you want to go
west from the interchange and are currently heading north, you probably want 68B
(pass 68A, go over the bridge, and take 68B) but not all interchanges work this
way. Sometimes the letters increase in the same direction the numbers increase,
so you'll pass 68A to get to 68B, but sometimes the letters increase in the
direction of travel, so 68B leads to the same road that 68A leads to if you are
traveling on the current road in the other direction. Sometimes there is a
single exit ramp for many or all of the intersecting roads, and you have to
split after you exit, and sometimes not. There are lots of really complicated
intersections and road numbers when your highway designers were cows! Less than
a mile from where I'm sitting, there is a road that is simultaneously Mass Rt 2
East, Mass Rt 16 West, US 3 South, Fresh Pond Parkway South and, for 1 block,
Concord Ave. East. (Or MA 2W, MA 16E, US 3N, Fresh Pond Parkway North and
Concord Ave West if you are going in the other direction.)
On 3/23/2023 1:52 PM, Owen DeLong via ARIN-PPML wrote:
On Mar 22, 2023, at 10:13, William Herrin <[email protected]> wrote:
On Wed, Mar 22, 2023 at 10:05 AM David Farmer <[email protected]> wrote:
When I look at section 2 as a whole, I believe the term Number
Resources logically belongs near the top of the list and not near the bottom of
the list.
Hi David,
If you're just looking at the static document, you're right. But
here's the thing: there are postings, tutorials and even books that
refer to "section X.X of the ARIN NRPM." It's a whole ecosystem of
knowledge. If you renumber the sections so that those references no
longer line up, you contribute to the general chaos instead of making
things easier to understand.
It's like the problem of numbering the exits on the Interstate
highways. If you just number them in order, 1 2 3 4 5, then whenever
you add a new off-ramp you have to change all the numbers. Suddenly
all the maps are wrong.
Well… They do actually just number them in order, sort of… They number
them based on the number of miles between the western or northern point
where the highway enters the state or begins. In cases where more than one
exit ends up within the same mile, sometimes they fudge (+/- 1 mile) and
more often they use a/b/c/d (counting west to east).
Indeed, if an exit ends up being installed between (e.g. 23b and 23c), then
they do in fact end up renumbering 23c->23d etc. to create a new 23c and
all the maps are, indeed, wrong.
This usually isn’t a problem since all the maps would be wrong if they didn’t
show all the exits anyway.
Owen
Further, if added to the top of the list, the added details of Bill's proposed
definition seem much more appropriate to me.
I appreciate the support!
Regards,
Bill
--
For hire. https://bill.herrin.us/resume/
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