Highest sequential exit number remaining

[Pete from Boston]

The highest I can think of is on the Wilbur Cross Highway (CT 15) at Exit 91. 

Any higher?

[1995hoo]

I believe I-95 in Connecticut goes up to Exit 93.

[spmkam]

NY-17, future I-86, has exit 131A

[english si]

Several Autobahn in Germany get over 100, but only the A7 beats 131A, with the highest of 139.

[vdeane]

NY-17, future I-86, has exit 131A

Just 131... there is a 130A though.

[Duke87]

All sequentially numbered highways remaining in the US with top exit # over 50:
1) NY 17 (131)
2) I-395, CT (100)
3) I-95, CT (93)
4) CT 15 (91)
5) I-84, CT (74)
6) I-495, NY (73)
7) NY 27 (66)
8) NYS Thruway (61)
T-9) I-95, MA (60)
T-9) MA 2 (60)
11) I-495, MA (55)
12) I-278, NY (54)
13) I-81, NY (52)

Can't speak for other countries but the Germany example is probably a good candidate for worldwide highest.

[cpzilliacus]

Not the highest, but the only sequentially numbered exits left in Maryland are on I-695 (Baltimore Beltway).

Highest one is Exit 44, on the east side of the F.S. Key Bridge.

[Bickendan]

Had to check A/AP-7 in Spain. Its sequential series on the France origin gets up to the high 50s. It gets to the high 40s on the Gibraltar origin. The Gibraltar origin for the kilometer-based numbers get up to 1168 in Tarragona, likely reflective of N-340.

The two highways have some of the most messed up exit number series I've ever seen.

[CNGL-Leudimin]

Heck, they are now replacing mileposts on most of A-7, taking the ones on Vilavella-Sagunt section as reference. The only section that remains unchanged is the one in Tarragona province with its four digit exits, the lowest being 1123 and the highest 1168. BTW, the origin of that is in Tres Caminos near Cadiz, not Gibraltar.

As for sequential exit numbering one have to look over Germany. A1 reaches exit 150, but it starts at exit 5 and it still has a gap between exits 114 and 117. A7 is the longest continuous one, reaching 140 exactly at Austrian border, with exit 1 being the Danish one.

[PHLBOS]

Not the highest, but the only sequentially numbered exits left in Maryland are on I-695 (Baltimore Beltway).

Highest one is Exit 44, on the east side of the F.S. Key Bridge.

How did that road avoid an interchange number conversion as of yet?  One would've thought it would've been done at the same time I-95 in MD was converted or when the I-695 designation was extended to the Key Bridge (it originally opened as MD 695 IIRC).

[Bickendan]

Heck, they are now replacing mileposts on most of A-7, taking the ones on Vilavella-Sagunt section as reference. The only section that remains unchanged is the one in Tarragona province with its four digit exits, the lowest being 1123 and the highest 1168. BTW, the origin of that is in Tres Caminos near Cadiz, not Gibraltar.

As for sequential exit numbering one have to look over Germany. A1 reaches exit 150, but it starts at exit 5 and it still has a gap between exits 114 and 117. A7 is the longest continuous one, reaching 140 exactly at Austrian border, with exit 1 being the Danish one.

Does this mean that A/AP-7 is intended to have a single origin for its entire length? And will it be sequential or km-based?

[english si]

Heck, they are now replacing mileposts on most of A-7, taking the ones on Vilavella-Sagunt section as reference. The only section that remains unchanged is the one in Tarragona province with its four digit exits, the lowest being 1123 and the highest 1168. BTW, the origin of that is in Tres Caminos near Cadiz, not Gibraltar.

As for sequential exit numbering one have to look over Germany. A1 reaches exit 150, but it starts at exit 5 and it still has a gap between exits 114 and 117. A7 is the longest continuous one, reaching 140 exactly at Austrian border, with exit 1 being the Danish one.

Does this mean that A/AP-7 is intended to have a single origin for its entire length? And will it be sequential or km-based?

And will it vary from state to state like now?

The highest in the UK is the A1(M)'s 65, but there's lots of gaps (1-10, 14-17, 34-38, 40-51, 56-65 exist) and will be some missing ones too (the gap between junction 51 and junction 56 will only have two junctions on it. The A14 ends at 64 and has a great many 'A' junctions, but those are related to the lack of access control.

[MASTERNC]

Not the highest, but the only sequentially numbered exits left in Maryland are on I-695 (Baltimore Beltway).

Highest one is Exit 44, on the east side of the F.S. Key Bridge.

How did that road avoid an interchange number conversion as of yet?  One would've thought it would've been done at the same time I-95 in MD was converted or when the I-695 designation was extended to the Key Bridge (it originally opened as MD 695 IIRC).

I don't remember why.  However, given the frequency of the interchanges, the sequential numbers are fairly close to the mile markers.

[PurdueBill]

Not the highest, but the only sequentially numbered exits left in Maryland are on I-695 (Baltimore Beltway).

Highest one is Exit 44, on the east side of the F.S. Key Bridge.

How did that road avoid an interchange number conversion as of yet?  One would've thought it would've been done at the same time I-95 in MD was converted or when the I-695 designation was extended to the Key Bridge (it originally opened as MD 695 IIRC).

I don't remember why.  However, given the frequency of the interchanges, the sequential numbers are fairly close to the mile markers.

MD I-695 is so close overall to one exit per mile on average that it would be more trouble than it's worth to renumber in my opinion...adding A-B or A-B-C suffixed exits in some places only to skip a number elsewhere? Why bother.  Same idea as the southern end of ME I-295 where the mileage-based numbers would be nearly identical to the old sequential ones, so better to just leave them.

[Bickendan]

Or even I-84's sequential set in Portland between I-5 and the northern I-205 interchange. Since the portion east of I-205 reflects the mileage of I-80N had the Mt Hood been built, what would have been the US 30 portion of the Banfield is two miles too short to make up for it, so the sequential series gets the portion west of I-205 caught up without too much fuss.

[CNGL-Leudimin]

Does this mean that A/AP-7 is intended to have a single origin for its entire length? And will it be sequential or km-based?

A-7 and AP-7 are two completely different things, so they have different origins: AP-7 has km 0 on the French border while A-7 will have its origin somewhere around Barcelona from now. A-7 has, and will continue to have, km-based exit numbers, while AP-7 is quite weird, as it has sequential based exit numbering at first and then just East of Alicante switches to km-based. As for the AP-7 section Southwest of Malaga, I think they should just renumber it to AP-46.

Anyway, I'm working on a worse mess: The Knot Island Expressway. Since I have pegged the (km-based) exit numbering to road numbers it switches numbering twice in less than 10 miles! Then it uses the third numbering for another 25-30 miles (Final lenght has not been finalized).

PS: Coincidentally, last weekend I clinched some of A-7 in Tarragona province, leaving only a 5 mile gap from completion.

[mapman1071]

All sequentially numbered highways remaining in the US with top exit # over 50:
1) NY 17 (131)
2) I-395, CT (100)
3) I-95, CT (93)
4) CT 15 (91)
5) I-84, CT (74)
6) I-495, NY (73)
7) NY 27 (66)
8) NYS Thruway (61)
T-9) I-95, MA (60)
T-9) MA 2 (60)
11) I-495, MA (55)
12) I-278, NY (54)
13) I-81, NY (52)

Can't speak for other countries but the Germany example is probably a good candidate for worldwide highest.

7) NY 27 (66) First Numbered Exit 37 at NY 109, Suffolk County

12) I-278, NY (54)  First Numbered Exit 3 Western Avenue, Staten Island
I - 278 also skips exits 37, 38 & 39

[Alps]

12) I-278, NY (54)  First Numbered Exit 3 Western Avenue, Staten Island
I - 278 also skips exits 37, 38 & 39

Odd, Saw Mill River Parkway also begins at Exit 3 and skips random numbers. Was there something about Exits 1 and 2? For that matter, I-495 LIE WTF?

[NE2]

I-278 skips because they never finished the renumbering. I think I-95 is still partly mile-based, jumping randomly on the Cross-Bronx.

[Road Hog]

U.S. 75 is the only freeway in Texas with sequential exit numbering. It goes up to Exit 75, funny enough, at the info center at the Red River bridge.

The numbers do skip in Dallas (from 8 to 20) at the High Five, but that is because numerous exit ramps were consolidated when Central Expressway was reconstructed between downtown and LBJ. The new exits were renumbered, but the exit numbers north of LBJ were unchanged.

[empirestate]

Odd, Saw Mill River Parkway also begins at Exit 3 and skips random numbers. Was there something about Exits 1 and 2? For that matter, I-495 LIE WTF?

I'm thinking its numbering scheme originates at Broadway (US 9); I believe the Henry Hudson Parkway south of there was later construction, and the name was later applied up to the city line, overtaking the first couple exits on the Saw Mill.

[NE2]

A 1956 map shows exits 1-18 on the HHP and no numbers on the SMRP: http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~212265~5500324:Shell-Map-of-Metropolitan-New-York,
1965 Rand McNally has the same on the HHP and 3+ on the SMRP. Weird. Perhaps 1-2 were meant for the Mosholu.

Also note that the Interboro began at 5, probably to match the GCP at their merge. And the SSP began at 13; in 1965 1-12 was on the CIP (and the Belt went up to 36 just before the CIP/SSP, due to new interchanges east of 10).

[vdeane]

12) I-278, NY (54)  First Numbered Exit 3 Western Avenue, Staten Island
I - 278 also skips exits 37, 38 & 39

Odd, Saw Mill River Parkway also begins at Exit 3 and skips random numbers. Was there something about Exits 1 and 2? For that matter, I-495 LIE WTF?

NY 17 starts at 4 and skips a ton too.

[Duke87]

NY 27 (66) First Numbered Exit 37 at NY 109, Suffolk County

There is a significant gap in Freeway but NY 27 has exits numbered 1-6 on the Prospect Expressway in Brooklyn/

I-278, NY (54)  First Numbered Exit 3 Western Avenue, Staten Island

I would speculate that the implication is that exits 1 and 2 are in New Jersey, for I-95/NJTP and NJ 439 (these exits do not have signed numbers).

Odd, Saw Mill River Parkway also begins at Exit 3 and skips random numbers. Was there something about Exits 1 and 2?

More speculation: intended continuous numbering with the Mosholu Parkway. This one I think I'm less likely correct on, though.

For that matter, I-495 LIE WTF?

And this bit of speculation I think I'm most likely correct on out of the three: I-495's exit numbers assumed the Midtown Manhattan Expressway would be built and numbered continuously with what's now NJ 495. You'd then have exits 1-7 in New Jersey and 8-12 in Manhattan.

[NE2]

NY 27 (66) First Numbered Exit 37 at NY 109, Suffolk County

There is a significant gap in Freeway but NY 27 has exits numbered 1-6 on the Prospect Expressway in Brooklyn/

But then it resets to 1 on Linden Boulevard.