Longest string of consecutive *state-level highway* exits?

[DJ Particle]

Just state highways, no local control, US, or Interstate highways.  Let's find the longest chain!

Massachusetts has some impressive ones...

US-6 (5 exits)

9 (78): MA-134
10 (82):  MA-124
11 (85):  MA-137
12 (89):  MA-6A
13A (91A):  MA-6A/28 (though YMMV whether this still counts as an exit.  It used to be signed "Exit 13S" until the mid-1980s)

But wait, here comes MA-3 with a chain of 6!

9 (18):  MA-3A
10 (20):  MA-3A/53
11 (22):  MA-14
12 (27):  MA-139
13 (32):  MA-53/123
14 (35):  MA-228
(If Derby St was still MA-228 Southbound, the chain would be 8)

Can anyone think of longer strings?  I know Long Island has a ton of state highways, for example.  I just listed the ones off the top of my head.

[tdindy88]

A couple from Indiana.

I-69 with a chain of 6:
214: SR 13
218: SR 38
222: SR 9/67
226: SR 9/109
234: SR 32/67
241: SR 332

If it weren't for a recent decommissioning at Exit 210 (former SR 238) this could have been a chain of 8 exits in a row.

I-65 with a chain of 7:
146: SR 47
158: SR 28
168: SR 38
172: SR 26
175: SR 25
178: SR 45
188: SR 18

[hotdogPi]

Another 6 or 7:

I-93

48: MA 213
1: NH 38
2: NH 97
3: NH 111
4: NH 102
5: NH 28
Unnumbered: NH 101 (it's also I-293)

[NWI_Irish96]

A couple from Indiana.

I-69 with a chain of 6:
214: SR 13
218: SR 38
222: SR 9/67
226: SR 9/109
234: SR 32/67
241: SR 332

If it weren't for a recent decommissioning at Exit 210 (former SR 238) this could have been a chain of 8 exits in a row.

I-65 with a chain of 7:
146: SR 47
158: SR 28
168: SR 38
172: SR 26
175: SR 25
178: SR 43
188: SR 18

Fixed the West Lafayette exit for you.  I-64 in Indiana also has a chain of 6, from exits 63 to 105.

[formulanone]

I-95 in Florida:

Exit 25: SR 84
Exit 23: SR 818
Exit 22: SR 848
Exit 21: SR 822
Exit 20: SR 820
Exit 19: SR 824
Exit 18: SR 858

This is going to be easier in the SR-heavy states.

Could theoretically include Exit 26, with SR 736 and I-595 (736 is not a hidden designation, part of another exit ramp), and then collect SRs 842, 838, and 816 by going north from there.

[hotdogPi]

If US/state combinations don't disqualify:

I-91:

19: MA 9
20: MA 9, MA 10
21: MA 10
22: MA 10
23: MA 10
24: MA 10
25: MA 116
26: MA 2, MA 2A
27: MA 2
28: MA 10
1: VT 142
2: VT 9
3: VT 9

[froggie]

I-91:
1: VT 142

Ummm...that's US 5...

DJ:  are you including unnumbered state highways?  If so, then I-89 VT has a stretch of 9, from Exit 2 (VT 132) to Exit 10 (VT 100).

[Mapmikey]

I-64 Virginia has 9:

1.  VA 33-249
2.  VA 106
3.  VA 155
4.  VA 33
5.  VA 30
6.  VA 30
7.  VA 199
8.  VA 143
9.  VA 199

It used to be 14 until they built the connector to Busch Gardens with a direct interchange with I-64

10.  VA 143
11.  VA 143/238
12.  VA 105
13.  VA 143
14.  VA 171

[roadman]

Just state highways, no local control, US, or Interstate highways.  Let's find the longest chain!

Massachusetts has some impressive ones...

US-6 (5 exits)

9 (78): MA-134
10 (82):  MA-124
11 (85):  MA-137
12 (89):  MA-6A
13A (91A):  MA-6A/28 (though YMMV whether this still counts as an exit.  It used to be signed "Exit 13S" until the mid-1980s)

Orleans Rotary hasn't been signed with an exit number since the 1994 sign replacement project, nor is one proposed under the milepost exit renumbering project.

[ET21]

I-355
Exit-22: IL-56
Exit-24: IL-38
Exit-27: IL-64

I-39
Exit-99: IL-38
Exit-104: IL-64
Exit-111: IL-72

I-94:
Exit-21: IL-22
Exit-19: IL-60
Exit-16: IL-176
Exit-13: IL-137
Exit-11: IL-120
Exit-10: IL-21
Exit-8: IL-132
Exit-2: IL-173

[webny99]

Just state highways, no local control, US, or Interstate highways.  Let's find the longest chain!

I was curious about the bolded phrase, so I looked up one of your examples. Apparently, "no local control" does NOT mean what I thought it meant. 

[jp the roadgeek]

I-84 in CT

Exit 67: CT 31
Exit 68: CT 195
Exit 69: CT 74
Exit 70: CT 32
Exit 71: CT 320
Exit 72: CT 89
Exit 73: CT 190
Exit 74: CT 171

If you include SR's (SR 533 for Exit 66), you could also add Exits 63-66 (63-65 have combos of CT 30/83)

[ozarkman417]

Does the exit have to only feature a state route, or can it share with another route of a different class?
Would Missouri supplemental highways count as state highways in this case?

[webny99]

I-490 has eight straight, over the course of 20 miles, starting with the western terminus.
Exits 1 - 8:
NY 19 / NY 33/33A / NY 36/ NY 259 / NY 386 / NY 204 / NY 33 / NY 531

As long as we can skip over the joke that is I-790, the NYS Thruway has nine straight between Syracuse and Albany.
Exits 34 - 27:
NY 13 / NY 365 / NY 233 / NY 8/12 / NY 28 / NY 169 / NY 10 /NY 30A / NY 30

I thought I could get something going with I-86/NY 17, but I couldn't find any 7+ strings. The strings get broken up by either county routes, or exits with no route whatsoever, such as Schoolhouse Road, Lounsberry, Oquaga Lake, etc.
I-81 is riddled with US 11 interchanges for its entire length in NY, so that's out. And I-390 doesn't have any 5+ strings, unless we can count "TO NY 415", in which case we can get up to seven.

[TheHighwayMan3561]

The longest I can think of in MN is 4:
180: MN 23 Mora exit, south end of duplex
183: MN 48
191: MN 23 Sandstone exit, north end of duplex
195: MN 23 Askov exit

I'm not sure based on the criteria if these count because of the adjoining county road connections to most of these, figured maybe since the state route is the primary route.

[TheStranger]

The two California examples I can think of:

I-5
391: Route 165
403: Route 33/152
407: Route 33
418: Route 140

Route 99
254A: Route 4
254B: Route 26
255: Route 88

[Mr. Matté]

In northern PA along I-81: 11

197: PA 632
199: PA 524
201: PA 438
202: PA 107
206: PA 374
211*: PA 106
211*: PA 92
217: PA 547
219: PA 848
223: PA 492
230: PA 171

*pair of partial interchanges that complement each other

It helps that PennDOT (under the old name) specifically designated a lot of state highways along roads that interchanged with new Interstates.

[ilpt4u]

I-355
Exit-22: IL-56
Exit-24: IL-38
Exit-27: IL-64

I-39
Exit-99: IL-38
Exit-104: IL-64
Exit-111: IL-72

I-94:
Exit-21: IL-22
Exit-19: IL-60
Exit-16: IL-176
Exit-13: IL-137
Exit-11: IL-120
Exit-10: IL-21
Exit-8: IL-132
Exit-2: IL-173

IL I-180 has 3 in a row, also 

IL 71/26, IL 29, IL 26...tho that partially depends on how one defines "exit"

I-55:
Exit 63: IL 48
Exit 60: IL 108
Exit 52: IL 16
Exit 44: IL 138

[cwf1701]

I can come up with 3 in a row on NB I-75 in Detroit

Exit 49 M-10 (Lodge Freeway)
exit 50 M-5 (Grand River)
Exit 51B M-3 (Gratiot)

[ilpt4u]

As long as the Kentucky Parkways are considered State Routes (which they are), I am counting 8 on I-69 in KY

Exit 116: KY 281
Exit 114: KY 70
Exit 111: KY 2171
Exit 108: KY 813
Exits 106B-A: Western KY/Pennyrile Parkways
Exit 92: KY 109
Exit 81: KY 293
Exit 79: KY 139

[Flint1979]

Longest in my area is three.

For I-75
Exit 151 is M-81
Exit 153 is M-13
I-675 exit 150  gets in the way of having a third state highway M-46 at exit 149.

This is three exits in a row
Exit 160 is M-84
Exit 162 is M-25 with US-10 coming in from another direction so this should count.
Exit 164 is M-13 connector which is considered a state highway even though it's a connector to that state highway.

[SteveG1988]

Can we consider parkways to be state-level highways?

287/87 in NY

Exits 1-7 are all State roads.
NY119,NY9A,Sprain Brook Parkway, etc.

[bzakharin]

In NJ I-295 has:
Exit 34 is NJ 70
Exit 36 is NJ 73
Exit 40 is NJ 38

Garden State Parkway:
Exit 98 is NJ 34 and NJ 138
Exit 100A is NJ 33
Exit 100B-C is NJ 66

Atlantic City Expressway:
Exit 17 is NJ 50
Exit 28 is NJ 54
Exit 31 is NJ 73

[ilpt4u]

Can we consider parkways to be state-level highways?

If they are maintained by a State Agency, I'd say yes

Biggest exception immediately coming to mind would be the US Park Service-maintained section of the Baltimore-Washington Parkway

Summerlin Parkway in Vegas was Locally Controlled, but I believe NDOT recently took over the Parkway

The KY Parkways are maintained by KYTC

I don't know enough about the NY Parkways to know if they are State or Locally maintained

[BrianP]

Maryland/Delaware:
I-70 (7):
MD 144 [56]
MD 144 [59]
MD 75
MD 27
MD 97
MD 32

I-95(12):
MD 43
MD 152
MD 24
MD 543
MD 22
MD 155
MD 222
MD 272
MD 279
DE 896
DE 273
DE 1/7/58

I wish I could include DE 141 but it has the same exit number (5 A,B,C) as I-295.

The I-95 string could be broken when the new interchange is added between MD 222 and MD 272.  Though the interchange may be assigned an unsigned state route.  See Montrose Road interchange on I-270.  So maybe it will become 13 in a row. Assuming unsigned routes are ok.