What is the most heavily used interchange for each interstate in your state?

[PHLBOS]

For southeastern PA, the I-76/US 202/422 interchange complex in Valley Forge/King of Prussia.

[Chris19001]

For southeastern PA, the I-76/US 202/422 interchange complex in Valley Forge/King of Prussia.

If we're just counting I-76 on and off-traffic, I'd be curious if KOP beat the Roosevelt Expressway/City Avenue interchange closer to Center City..?  That also has a seemingly constant jam..

[CtrlAltDel]

Well, California probably has everyone beat. I-10 and I-5 at the same interchange - East Los Angeles Interchange.

Interstate to interstate interchanges don't count. The busiest service interchange, if I had to guess, would be somewhere on the 405 since that is the road with the most traffic.

[pianocello]

I'll go with the ones I know (or at least have decent guesses at):

I-74 Iowa: 53rd Street. Tons of retailers near that interchange, and many people use it for their daily commutes as well.
I-74 Illinois: I would guess the interchange in East Peoria for the Bob Michel Bridge. Signed for downtown, also serves one of Peoria's big shopping areas.
I-80 Illinois: This is a tough one. My guess would be US-45 in Mokena.
I-280 Illinois: IL-92/Centennial Expressway.
I-280 Iowa: US-61/River Dr
I-380 Iowa: Probably IA-100/Collins Rd NE

[Alps]

The only one I would know for New Jersey:

I-95 / New Jersey Turnpike: Exits 73/74 and the George Washington Bridge

These others are complete guesses:

I-287: Either Exit 21 (I-78) or Exit 41 (I-80). Alternatively, Exit 37 for NJ 24.
I-78: Exit 52 (GSP)

EDIT: Didn't read the question thoroughly enough. Still stand for NJ 24 on I-287.

I'm going to go for all the guesses.

I-76: Exit 1C/US 130
I-78: Exit 48/NJ 24
I-80: Exit 53/NJ 23-US 46 (GSP and NJ 17 are also in the running)
I-95: Exit 6/NJ 700 (cheating? okay, Exit 72/US 1-9-9W-46-NJ 4)
I-195: Exit 5/US 130 (Seasonally, Exit 16/CR 537 may be even more)
I-278: Exit 1/US 1
I-280: Exit 12/Parkway
I-287: Exit 37/NJ 24 (honorable mentions Exit 17/US 202-206, Exit 39/NJ 10, Exit 59/NJ 208)
I-295: Exit 67/US 1
I-495 (former): NJ 3
I-676: Exit "6"/US 30

[DeaconG]

In Florida I would have to say I-4's busiest is Exit 74A for Sand Lake Road.  It serves many tourist areas, including the Dr. Phillips area of Orlando with its recent developmental sprawl and of course Universal Studios nearby.

In New Jersey on I-95 it would be Exit 11 in Woodbridge.  Back when I lived there it was the NJ Turnpike's busiest interchange with the road system's largest (maybe second largest if Exit 16E/ 18E is larger) toll plaza.  The fact is that for an exit plaza it was always with more lanes than even the mainline plazas at Exit 1 and 18W or many other state mainline plazas.

In New Jersey on I-78 it always was Exit 33 for Martinsville Road.  At one point NJDOT had to widen the overpass because corporate development in the area increased traffic counts through the interchange.

For I-4 I'd say "yes, but"...considering that the entire section from Sand Lake to Conway is a painful issue to begin with, I would argue the I-4/Turnpike trumpet or the I-4/SR 408 mess would also fit the description. I-4 at I-275 isn't even close.

I-10...the interchange with I-95 definitely qualifies with the I-10/I-295 interchange a real close second.

[hotdogPi]

I-10...the interchange with I-95 definitely qualifies with the I-10/I-295 interchange a real close second.

The interchange with I-95 doesn't qualify at all. It's an Interstate to Interstate connection.

[Pete from Boston]

-84: CT 8 in Waterbury (the so-called "mix master")

I would guess a higher volume uses the CT 15/Charter Oak Bridge exit.  That exit handles a very significant amount of the auto traffic between Boston and New York.  (I wouldn't argue with your choice of the same for I-91, though the Wilbur Cross Parkway exit would be up there.)

[brownpelican]

MISSISSIPPI

I-10: US 49 (34 A&B), Gulfport
I-20: US 49 (47 A&B), Pearl
I-22: No idea
I-55: Lakeland Drive (98), Jackson or County Line Road (103), Jackson-Ridgeland border
I-59: US 49 (67 A&B) or US 98 (65), Hattiesburg

[cwf1701]

For Michigan:

I-75: M-102 (8 mile) or Bridge to Canada (Exit 47)
I-94: Metro Airport (Detroit)
I-96: I-96/I-275/I-696/M-5 or I-96/M-39
I-275: I-275/I-96/M-14
I-696: I-696/M-10/US-24

[froggie]

For I-64 in VA, most likely Exit 263 for US-258 in Hampton.

Stronger arguments could be made for either VA 143/Exit 255 or US 13/Northampton Blvd.

I-564: VA-406.

The Gate 3 interchange.  From years of personal experience.

Aren't you forgetting the Braintree Split (I-93 (US 1)/MA 3)?

He was.

I-59: Don't know much about this strecth, maybe US 11 (exit 3)

Yep.  Pretty much the only interchange on 59 that isn't a frontage road or doesn't dead-end.

I-95: Well, it's definitely in Northern Virginia. Probably one of the parkways (VA 286 or VA 294)

SR 644/Franconia Rd.  Though US 1 in Alexandria comes close.

I-395: Old Mixing Bowl

If you're referring to near the Pentagon, then yes.  More specifically, the ramps to/from VA 27.

I-495: VA 7

I'd think DTR would be more volumnous.

I-66: insert Ethanman joke here

Indeed.  Though in reality, I think arguments could be made for each of VA 28, Fairfax County Pkwy, and US 50/Fair Oaks.

I don't have enough knowledge/experience with I-81 to make an educated guess.

I'd think it'd be a toss-up between US 11/460/Christiansburg, US 220 north of Roanoke, or US 33/Harrisonburg.

I-22: No idea

Probably at US 45 in Tupelo.

I-59: US 49 (67 A&B) or US 98 (65), Hattiesburg

The former.  Even MS 43 North/Exit 6 has more traffic than the latter.  Though other strong possibilities exist in one of the Meridian interchanges (whether US 11/MS 19, MS 145, or MS 19/39).

--------

Since HighwayMap394 didn't catch the no-Interstate-to-Interstate note, here's my stab at Minnesota's:

I-35:  likely at CSAH 5/50 in Lakeville.
I-35E:  either CSAH 31/Pilot Knob Rd or Ramsey CSAH 96
I-35W:  easily MN 62 (arguably the busiest interchange in the entire state).
I-90:  this one's tough, as I-90 is lightly traveled compared to the other Minnesota interstates.  I'd guess the eastern US 14/61 interchange next to the Mississippi River, as a lot of the traffic at US 52 or at US 63 is through traffic on the respective US route.
I-94:  likely the US 169 interchange, though MN 280 would be a contender.
I-394: likely MN 100.
I-494: Several high-volume interchanges along I-494.  If I were to pick one, it'd be the MN 5 East interchange near the airport.
I-535:  technically, I wouldn't count this route, as there's only one interchange that isn't at another Interstate
I-694:  US 10/MN 51 by far (specifically the US 10 part).


For Vermont, I don't count I-93 or I-189 as (like I-535 MN) they only have one non-Interstate interchange each.  I-89 is easy, as the US 2/Exit 14 interchange is the busiest in the state.  I-91 is fairly lightly traveled (especially compared to I-89).  Based on experience, it would likely be one of the following:  VT 9/Bennington, US 5/White River Jct, or US 5/VT 10A/Norwich.

[roadman65]

In Florida I would have to say I-4's busiest is Exit 74A for Sand Lake Road.  It serves many tourist areas, including the Dr. Phillips area of Orlando with its recent developmental sprawl and of course Universal Studios nearby.

In New Jersey on I-95 it would be Exit 11 in Woodbridge.  Back when I lived there it was the NJ Turnpike's busiest interchange with the road system's largest (maybe second largest if Exit 16E/ 18E is larger) toll plaza.  The fact is that for an exit plaza it was always with more lanes than even the mainline plazas at Exit 1 and 18W or many other state mainline plazas.

In New Jersey on I-78 it always was Exit 33 for Martinsville Road.  At one point NJDOT had to widen the overpass because corporate development in the area increased traffic counts through the interchange.

For I-4 I'd say "yes, but"...considering that the entire section from Sand Lake to Conway is a painful issue to begin with, I would argue the I-4/Turnpike trumpet or the I-4/SR 408 mess would also fit the description. I-4 at I-275 isn't even close.

I-10...the interchange with I-95 definitely qualifies with the I-10/I-295 interchange a real close second.

Actually I am looking not so much as overall traffic counts, but as traffic that backs up onto the highway.  Exit 74A Eastbound does that as both Kirkman and the Florida Turnpike have high speed connectors even though they may have higher numbers. 

Exit 74A does that on random moments as tourists mostly use this exit and it all depends on what business is in town or what demographics are as many people from a certain region vacation all at the same moments, etc.  Sometimes the ramp traffic held by the Sand Lake Signal backs vehicles up on half mile onto I-4 itself

[Pete from Boston]

Actually I am looking not so much as overall traffic counts, but as traffic that backs up onto the highway.

Funny, I somehow got the impression you meant most heavily used interchange.

Perhaps the thread ought to be titled "most congested interchange for each interstate in your state" or something of the like that, you know, tells people what you're looking for.

[cl94]

Actually I am looking not so much as overall traffic counts, but as traffic that backs up onto the highway.

Funny, I somehow got the impression you meant most heavily used interchange.

Perhaps the thread ought to be titled "most congested interchange for each interstate in your state" or something of the like that, you know, tells people what you're looking for.

Agree. "Most heavily used", by definition, implies "highest volume". Something can be congested if usage is relatively low if the design level is low.

[dfwmapper]

Is the intent to exclude all freeway to freeway interchanges, or only those with other Interstates? If it's specifically Interstates only, then other freeway to freeway connections would account for a lot of them on the list. I-405 in California was mentioned earlier, and that has an obvious pick of US 101 if non-Interstate freeways are permitted. If not, then it's probably Century Blvd at LAX, or maybe Wilshire Blvd at UCLA.

[Mileage Mike]

North Carolina

I-85/Concord Mills Blvd (Exit 49), I actually remember reading somewhere that this was the busiest interchange in the state.
I-485/US 521 (Exit 61A/B) is probably up there somewhere too.

[HistoricTeacher]

Defenitly the Zoo Interchange!

[midwesternroadguy]

Since HighwayMap394 didn't catch the no-Interstate-to-Interstate note, here's my stab at Minnesota's:

I-35:  likely at CSAH 5/50 in Lakeville.
I-35E:  either CSAH 31/Pilot Knob Rd or Ramsey CSAH 96
I-35W:  easily MN 62 (arguably the busiest interchange in the entire state).
I-90:  this one's tough, as I-90 is lightly traveled compared to the other Minnesota interstates.  I'd guess the eastern US 14/61 interchange next to the Mississippi River, as a lot of the traffic at US 52 or at US 63 is through traffic on the respective US route.
I-94:  likely the US 169 interchange, though MN 280 would be a contender.
I-394: likely MN 100.
I-494: Several high-volume interchanges along I-494.  If I were to pick one, it'd be the MN 5 East interchange near the airport.
I-535:  technically, I wouldn't count this route, as there's only one interchange that isn't at another Interstate
I-694:  US 10/MN 51 by far (specifically the US 10 part).

Driving regularly to and from Rochester, I would say that close to 50% of the westbound traffic on I-90 exits to US 52 (westbound), and likewise 50% of the (south) eastbound traffic on US 52 turns onto eastbound I-90.  This percentage drops with peak vacation travel times to the Black Hills.

[roadman65]

Malfunction junction in Tampa where I-4 and I-275 meet is a high volume interchange.  It was just reconfigured recently (well back in the late 90's, early 2000's) to handle all the vehicles more efficiently.

[freebrickproductions]

Alabama:

I-10: Junction I-65 north to Montgomery and Birmingham -or- US 90/98, Daphne/Fairhope (Exit 35 A-B)
I-20/59: "Malfunction Junction" interchange with I-65, downtown Birmingham -or- US 82 (McFarland Boulevard), Tuscaloosa (Exit 73)
I-20 (separate from I-59): US 411, Leeds/Moody (Exit 144-A/B)
I-22: will eventually be I-65 north of downtown Birmingham
I-59 (separate from I-20): Chalkville Mountain Road (Exit 141), Trussville
I-65: "Malfunction Junction" -or- US 31 (Montgomery Highway/Columbiana Road/Lorna Road), Hoover/Vestavia Hills (Exit 252)
I-85: Junction I-65, south to Mobile, north to Birmingham -or- AL-271 (Taylor Road), Montgomery (Exit 9)
I-459: US 280, Mountain Brook/Vestavia Hills/Hoover (Exit 19)

What say ye, fellow Alabamians, concerning I-359, I-565 and I-759?

I-565 is either the interchange with I-65, AL 255, or Memorial Parkway (US 231/431). It's most likely the last one though.

[froggie]

Driving regularly to and from Rochester, I would say that close to 50% of the westbound traffic on I-90 exits to US 52 (westbound), and likewise 50% of the (south) eastbound traffic on US 52 turns onto eastbound I-90.  This percentage drops with peak vacation travel times to the Black Hills.

Looking again at traffic counts, it very well might be US 52 that's the peak for I-90 MN.

[jakeroot]

Here's some guesses for Washington. I don't know where to find the actual stats. I excluded freeway-to-freeway junctions. Below, freeway-to-freeway refers to junctions that are entirely grade-separated and have no signals (so are either partial stacks, trumpets, etc) but do not necessarily connect to another freeway. I did not want to include junctions that were literally between two freeways, as those are easy picks.

I-5: Mercer Street (Exit 167), Downtown Seattle. Junction originally built for Bay Freeway (so it's freeway-to-freeway) but has become the main interchange for South Lake Union and points west.
I-405: Junction for either NE 4th or NE 8th near Downtown Bellevue (Exit 13B).
I-205: Mill Plain Blvd (Exit 28). I'm not including any of I-205 in Oregon.
I-90: Either the Bellevue Way or WA-18 junctions (Exit 9 and 25, respectively). Can't decide which. The former is freeway-to-freeway, but the latter is a diamond, so the 18 junction feels busier to me.
I-82: Most likely US-395 (Exit 113). Like others before, it's freeway-to-freeway, but US-395 is a very important connector between Canada and points south.
I-182: Most likely WA-240 (Exit 4). Also freeway-to-freeway. The 240 is a fairly important NW/SE connector road.

Washington has a lot of freeways without Interstate designation; this list would be very long if I included them all, but the original post just asks for Interstates, so that's what I've supplied.

[JCinSummerfield]

For Michigan:

I-75: M-102 (8 mile) or Bridge to Canada (Exit 47)
I-94: Metro Airport (Detroit)
I-96: I-96/I-275/I-696/M-5 or I-96/M-39
I-275: I-275/I-96/M-14
I-696: I-696/M-10/US-24

Without looking at any stats, I would say I-94's exit 177 (State St. in Ann Arbor) would top the Metro Airport exits.  I would bet I-69's would be somewhere in Lansing.

[doorknob60]

I'll take a shot at Idaho (these are based on personal observations, not data I found somewhere; I mostly am only in the Boise area so for other parts of the state I've visited less frequently, it may not be as accurate)

I-84: Eagle Rd. (ID-55)
I-184: Franklin Rd.
(note that the freeway-to-freeway interchange of I-84 and I-184 is by far the busiest intersection in the state, but it doesn't count in this thread)
I-86: US-91
I-15: Probably US-20
I-90: US-95

[intelati49]

Non interstate you say?

MO

I-44 - US65
I-49 - MO150
I-55 - US60
I-64 - MO364
I-70 - MO370