"Its peer pressure between DOTs, 'We're building SPUIs. Everyone is building SPUIs. Everyone's doing it.'"
- Jeff Kitsko, misc.transport.road, 05-27-1999

What is a SPUI?

state/link to TerraServer image city/metro area (I'm not anal about town lines so don't be in correction emails) road without the traffic light exit number road with the traffic light
bold means I have what's on the exit sign (from field info or Mapquest)
notes (over means bridge is over the traffic light, under means traffic light is over the bridge, half means the freeway ends there and it appears a full SPUI is planned or was once planned, frontage means you can go straight from the ramps, left means all freeway ramps are left ramps and so it is not usually considered a SPUI but I include it for completeness) other links
AB Calgary John Laurie Blvd 14th St NW Under
AB Calgary AB 8/Glenmore Trl Macleod Trl Under
AB Edmonton AB 16 Fort Rd/Capilano Dr Under
AB Edmonton AB 16 82nd St Under
AB Edmonton AB 16 AB 28/97th St Under
AK Fairbanks Johansen Expwy College Rd

AL

Huntsville

I-565

19A

Jefferson St
Washington St (EB)

AZ

Phoenix

I-10

144

7th Ave
Downtown Cultural/ Sports Facilities (EB)

Under

AZ

Phoenix

I-10

145

7th St
Downtown Cultural/ Sports Facilities (WB)

Under

AZ

Phoenix

I-17

204

Bethany Home Rd

Frontage over
UC (almost done)

AZ

Phoenix

I-17

205

Glendale Ave
Luke AFB (SB)

Frontage over
UC

AZ

Phoenix

I-17

206

Northern Ave

Frontage over
UC

AZ

Phoenix

I-17

207

Dunlap Ave
Glendale Comm College
Ottawa Univ

Frontage over
AZ Tucson I-19 95 Valencia Rd UC

AZ

Phoenix

AZ 51

1

McDowell Rd

Over

AZ

Phoenix

AZ 51

2

Thomas Rd

Frontage over

AZ

Phoenix

AZ 51

3

Indian School Rd
VA Medical Center

Over

AZ

Phoenix

AZ 51

Bethany Home Rd

Under

AZ

Phoenix

AZ 51

5

Glendale Ave
Lincoln Dr This Exit

Under

AZ Phoenix AZ 51 9 Shea Blvd
Paradise Valley (NB)
Scottsdale (NB)
Under

Frontage SB for buses only

AZ

Phoenix

AZ 51

10

Cactus Rd

Under

AZ

Phoenix

AZ 51

12

Greenway Rd

Under

AZ

Phoenix

AZ 51

13

Bell Rd

UC Under

AZ Phoenix AZ 101 Camelback Rd OR Indian School Rd Proposed
AZ Phoenix AZ 101 7 99th Ave/Glendale Ave proposed over
AZ Phoenix AZ 101 14 Bell Rd
Sundome
Peoria Sports Complex
Over

AZ

Phoenix

AZ 101

Cave Creek Rd

Over

Proposed

AZ

Phoenix

AZ 101

Tatum Blvd

Over

Proposed

AZ

Phoenix

AZ 101

38

Frank Lloyd Wright Blvd
Bell Rd

Over

AZ

Phoenix

AZ 101

39

Raintree Dr

Under

UC

AZ

Phoenix

AZ 101

40

Cactus Rd

Under

UC

AZ

Phoenix

AZ 101

41

Shea Blvd

Under

AZ

Phoenix

AZ 101

42

Pima Rd
90th St

Over

AZ Phoenix AZ 101 56 Guadalupe Rd Under
Frontage
AZ Phoenix AZ 143 2 University Dr
Rio Salado College
Over
AZ Phoenix AZ 143 4 Washington St
Gateway Community College (NB?)
Pueblo Grande Museum
Over

Weird 3/4 SPUI - no N-W or W-N ramps

To the north it actually connects to the ramps to/from AZ 202 on the west
AZ Phoenix AZ 153 1 University Dr Half
Over
AZ Phoenix AZ 202 1B 24th St Over
AZ Phoenix AZ 202 1C 32nd St Over
AZ Phoenix AZ 202 2 40th St (EB)
44th St
Chinese Cultural Center
Shrine Auditorium (EB)
Phoenix Greyhound Park (EB)
Over

Traffic to/from the west must also go thru a light at 40th St
AZ Phoenix AZ 202 7 Scottsdale Rd
Rural Rd
Scottsdale
Ariz State Univ
Over
AZ Tucson AZ 210 3 Kino Parkway Under
AZ Tucson AZ 210 Alvernon Way Under
BC Vancouver TC 1 26 BC 7A/Hastings St AND Bridgeway St Under

CA

Los Angeles

I-10

Archibald Ave
Ontario Airport

CA

San Francisco

I-80/580

Albany
(Buchanan St)

Over

No more

NB on and SB off left ramps (I-580 only)

Was a 3-way stop underneath

See map of new configuration

CA

San Jose

CA 87

Taylor St proposed under photos

CA

San Jose

CA 87

Skyport Dr proposed over
CA Stockton CA 99 Arch Rd under
frontage?
picture

CA

Riverside

I-215

Eucalyptus Ave
Eastridge Ave

under

CA

San Jose

CA 237

Middlefield Ave
Maude Ave

frontage over photos

CA

Los Angeles

CA 241

Portola Pkwy

CA

Los Angeles

CA 241

Alton Pkwy

All built but half closed?

CA Los Angeles Jamboree Rd (CA 261 southern extension) Walnut Ave
Edinger Ave (NB)
over

CA

San Francisco

I-680

Gregory Lane (SB)
Monument Blvd

Recently finished after some problems
over
Official page

CO

Colorado Springs

I-25

146

Garden of the Gods Road

Over

CO Denver US 85 Evans Avenue under WB
CO Denver I-225 8 Alameda Ave UC under

CO

Denver

CO 470

CO 8
Morrison Road

Over

NB

CT Bridgeport CT 15/Merritt Pkwy 48 CT 111 prop under
CT Hartford US 5/CT 15/Berlin Tpk CT 175 prop
FL Orlando I-4 30 FL 435 proposed left volleyball HOV
FL Orlando I-4 39 South St proposed left HOV over
FL Orlando I-4 41 FL 50 proposed
over
FL Orlando I-4 48 FL 436 proposed
under
FL Jacksonville FL 10/A1A Mayport Naval Station
FL A1A NORTH (?) (NB/WB)
frontage over

FL

Jacksonville

FL 9A

FL 10/Atlantic Blvd

Over

FL

Jacksonville

US 17/US 17A

Edgewood Ave

Frontage over
US 17A is the top level of a 2-level structure here; the bottom level has a normal light at Edgewood, and since there are easy on/off ramps to US 17 on both sides, it is technically a SPUI.

FL

St Petersburg

US 19

FL 688
Indian Rocks Bch
Tampa
TO I-275 (SB)
Ulmerton Road (SB?)

Frontage over

FL

St Petersburg

US 19

FL 686
Roosevelt Blvd
Largo
East Bay Drive (SB)
St Petersburg-Clearwater Intl Airport (SB)

Frontage over

WB

NB

FL

St Petersburg

US 19

FL 60
Clearwater
Tampa
Clearwater Beaches
Gulf to Bay Boulevard (SB)

Over

First SPUI in US, opened February 25, 1974

NB

XX

FL

St Petersburg

US 19

Countryside Blvd (NB)

Frontage over

FL

St Petersburg

US 19

FL 580
TO Evans Rd (NB)
Dunedin
Oldsmar
Countryside (SB)
Enterprise (SB)

Frontage over

FL Lake Wales FL 60 FL 17 over

it's sort of a SPUI - CR 60A is the old route of FL 60 - FL 60 goes over a RR bridge there - all left turns are concurrent
FL Jacksonville FL 115 US 90 frontage over

FL

Jacksonville

FL 202

Gate Pkwy

Over

FL Tallahassee FL 263 US 90 proposed over

FL

Orlando

FL 414

FL 434

Half

UC for full

FL

Orlando

TOLL 429

US 441 (NB)
Orange Blossom Tr (NB)
Apopka (NB)
Plymouth (NB)
Mount Dora (NB)

Half

FL Ft Lauderdale US 441(FL 7) FL 834
TO TOLL 869 (NB)
TO I-95 (SB)
Over
This was the first SPUI I went thru, but at the time I thought it was just a diamond :(

FL

Tampa

TOLL 589

6A

CR 584
Waters Ave

Over

FL

Tampa

TOLL 589

9

CR 587
Gunn Hwy
Citrus Park Town Center

Over

FL

Tampa

TOLL 589

10

Ehrlich Rd

Over

FL

St Petersburg

CR 611

FL 60
Clearwater
Tampa

Frontage over

FL

St Petersburg

FL 694

US 19
Clearwater
St Petersburg

Over

WB

EB

NB

FL

St Petersburg

FL 694/US 92(FL 600)

FL 687/US 92

UC?

FL Ft Lauderdale FL 838 US 441 (FL 7) over
frontage?
construction info
FL Ft Myers CR 867A/College Pkwy/Cape Coral Bridge FL 867
McGregor Blvd
North Landings Dr
Caloosa Y&R Club Dr
frontage over
FL Ft Lauderdale TOLL 869 16 Lyons Rd over
only onto TOLL 869 is SPUIed and the left turn lanes leave before the overpass

FL

Ft Myers

FL 884/CR 884

US 41
Cleveland Ave

Frontage over

FL Ft Myers CR 884 CR 867A
Del Prado Blvd
Coralwood Plaza
over
FL Naples CR 886 CR 31 proposed over

FL

Orlando

TOLL 4080

Valencia College Ln

Over

Built 1989-90

GA Atlanta I-75 239 Aviation Blvd HOV left under
GA Atlanta I-85 104 Pleasant Hill Rd Proposed

GA

Atlanta

GA 141

Tilly Mill Road
DeKalb College North Campus

Frontage over

XX (one of these 2 SPUIs)

GA

Atlanta

GA 141

Winters Chapel Road
Amwiler Road

Frontage over

GA

Atlanta

GA 141

GA 140
Jimmy Carter Boulevard

Frontage over

EB

GA

Columbus

I-185

6

GA 22 SPUR
Macon Rd

Over

GA

Atlanta

GA 400

2

GA 141
Lenox Rd
Buckhead

Under

Germany A46 34 Wuppertal-Elberfeld
Germany A52 14 Buderich Over
Germany A57 30 Ehrenfeld Under
Built by 1975
Germany A559 Koln-Kalk Over
Greece
IA Des Moines I-35 69 Grand Ave proposed
Iceland Vesturlandsvegur H�f�abakki under photo
ID Wallace I-90 62 BL 90/ID 4/Wallace/Burke over

IL

Chicago

US 41

23rd St

left under
dead

IL

Chicago

US 41

IL 132
Grand Ave

All left ramps

Over

IL Chicago I-55 287 Pulaski Rd
IL Chicago I-55 290 Damen Ave

IL

Chicago

IL 56

Highland Ave

Under

IL

Moline

I-74

2

7th Ave

Over

Second SPUI in US, opened September 9, 1975

XX

EB

IL

Chicago

IL 137

Grand Ave

Under

IL

Chicago

IL 137

Greenwood Ave

Half

Under

IL

Chicago

I-290

21B

IL 43
Harlem Ave

All left ramps

IL

Chicago

I-290

23A

Austin Blvd
6000 W (EB)

All left ramps

IN

South Bend

US 20

Ironwood Dr

over

IN

Indianapolis

US 31

All but 146th St

Proposed

IN Evansville IN 66 All but 146th St Proposed

IN

Columbus

I-65

68

IN 46
Nashville (NB)
Columbus

over

Cool architecture

IN Gary I-90 15 IN 53
Broadway

IN

Indianapolis

I-465

52

Emerson Ave
Beech Grove

under
IN Indianapolis I-465 46 US 40 was proposed but killed
KS Wichita US 54/400 West Street over
frontage WB
KS Kansas City I-70 223 KS 7 proposed under
KS Kansas City I-635 6 Parallel Pkwy proposed under

KY

Lexington

KY 4/US 25/421 (New Circle Rd)

13

US 60
Winchester Rd
Bert T Combs Mountain Parkway
Lexington
TO I-75
Winchester
TO I-64

under

KY

Frankfort

KY 676/US 421

US 60
US 421 NORTH
Frankfort
Versailles

Under

NB

KY

Louisville

I-264

14

KY 864
Louisville Zoo

Under

KY

Louisville

I-264

16

US 31E/US 150
Sullivan College
Farmington

Over

MA Boston MA 203/Arborway Forest Hills
Roslindale
Frontage over
2 SPUIs side by side
Malaysia
MD Washington DC MD 5 MD 223
Woodyard Rd
Mellwood
Clinton
Over
MD Washington DC MD 5 Coventry Way over
MD Washington DC MD 5 MD 337 Over

MD

Baltimore

MD 100

11

MD 170
Telegraph Rd
Odenton
Linthicum

over

MD

Rockville

I-270

5

MD 189
Falls Rd

Under

MD Annapolis MD 665 Riva Rd
Gov't Park
Over
MD Baltimore I-695 20 MD 140 UC under

MD

Washington DC

Inter-County Connector

Minnick Rd/Contee Rd

Over

Proposed

see map

MD

Washington DC

Inter-County Connector

MD 450

Over

Proposed

see map

MI Detroit I-75 63 12 Mile Rd proposed
MI Detroit I-75 65 14 Mile Rd proposed

MN

St Paul

US 10/61

Newport

Under

Proposed

UC in 2005

Open by 2007

MN

St Paul

US 10/61

CSAH 22

Under

Proposed

UC in 2005

Open by 2007

MN

Duluth

I-35

256B

5th Ave W
Lake Ave

Under

photo

MN

Rochester

US 52

NW 19th St

Proposed under

MN Minneapolis MN 55 CR 3/Lake St over
MN Minneapolis MN 100 MN 55 UC over

MN

Minneapolis

I-494

2A

24th Ave

Under

MN Minneapolis I-494 3 Portland prop under
MN Minneapolis I-494 4B Lyndale prop under
MN Minneapolis I-494 6A Penn prop under
MO St Louis MO 30 MO 141 proposed
over
MO Hannibal US 36 US 61 proposed

MO

Cape Girardeau

I-55

96

MO K

Proposed

MO

St Louis

I-55

197

US 61/US 67/US 50
Lindbergh Blvd

Under

MO St Louis I-64/US 40 34CD Hampton Ave proposed
under
MO St Louis I-64/US 40 36 Kingshighway proposed
under
MO Springfield US 65 MO D
Sunshine St
UC
MO St Louis I-70 218? Cool Springs Rd UC under
MO St Louis I-70 225 Cave Springs Rd proposed
MO St Louis I-70 227 Zumbehl Rd proposed
MO St Louis I-70 228 MO 94 Proposed
under
MO St Louis I-70 229 BL I-70/5th St proposed
MO St Louis MO 141 Big Bend Blvd proposed
MO St Louis MO 141 MO 100 over
MO St Louis MO 141 MO 340 proposed

MO

St Louis

I-170

5

MO 180
St Charles Rock Rd

Over

Not a true SPUI, opposite left turns are not concurrent, but it appears to have been one at first, but the left turn radius was too small AFAICT

MO St Louis I-270 14 MO 340/Olive Blvd proposed
under
MO St Louis MO SSR D (Page Ave)
(proposed MO 364)
Bryan Rd proposed
under

MS

Jackson

I-55

108

MS 463

UC under

MS

Gulfport

US 90

US 49

once prop?

NC Greensboro Wendover Ave Holden Rd all left ramps
over

NC

Asheboro

I-73/US 220

NC 42
Asheboro

All left ramps
under

NC Charlotte I-77 5 Tyvola Rd
Coliseum Area (NB)
under
opened late 1998
NC Charlotte I-85 34 NC 27
Freedom Dr
Tuckaseegee Rd (NB)
under

NC

Charlotte

I-85

36

NC 16
Brookshire Blvd
Downtown
TO US 74 EAST (NB)

Under

Built 1990-92

NC

Durham

NC 147

Hillandale Rd
Fulton St

NC Raleigh I-540 6 Forks Rd UC under photo
NC Raleigh I-540 US 401 proposed under
NE Omaha US 6 192nd St Proposed
NE Omaha US 6 180th St Proposed
NE Omaha US 6 168th St Proposed
NE Omaha US 6 156th St Under
NE Omaha US 6 144th St Under
NE Lincoln US 77 NE 2
Van Dorn St
Lincoln
under
NH Keene NH 101 NH 12? proposed
NH Exeter NH 101 11 NH 108 UC over
NH Concord I-93 13 US 3/Manchester St/Downtown over
NM Los Alamos US 84/285 NM 502 Over
NM Albuquerque NM 423 NM 448
Coors Rd
Over
NM Albuquerque NM 423 2nd St
4th St
Bus Dist
Over
left exits
NSW (Australia) Sydney Gore Hill Fwy/Metroad 1/2 Reserve Rd all right ramps (would be left in US)
under
NSW (Australia) Sydney M2 Pennant Hills Rd/Metroad 7 in Beecroft under
NSW (Australia) Sydney Metroad 3/Devlin St Victoria Rd/NSW 40 under
NSW (Australia) Sydney Fairford Rd/Metroad 6 Canterbury Rd/NSW 54 over
NSW (Australia) Sydney M5 King Georges Rd/Metroad 3 UC Under
NSW (Australia) Sydney M5 Marsh St UC Under
NSW (Australia) Sydney James Ruse Dr/Metroad 7/NSW 55 Pennant Hills Rd/Metroad 7 non-concurrent left (oops, right - this is Australia) turns onto the ramps

under
NV Las Vegas I-15 27 NV 146 proposed
with N-E flyover
NV Las Vegas I-15 41 Charleston Blvd over proposed
NV Las Vegas I-15 46 NV 574/Cheyenne Ave UC under

NV

Reno

I-80

12

Keystone Ave

NV Las Vegas US 95 81 NV 595/Rainbow Blvd proposed
NV Las Vegas NV 171/Airport Connector/Paradise Rd Russell Rd
Air Cargo (SB)
Over
NV Las Vegas I-215 2 Valle Verde Pkwy under
NV Las Vegas I-215 3 Green Valley Pkwy under

NV

Las Vegas

I-215

6

Windmill Lane

Under

NV Carson City US 50/395 US 395/NV 529 proposed over
NV Carson City US 50/395 US 50/NV 530 proposed over
NV Carson City US 395 College Pkwy proposed over
NY New York NY 9A NY 117
North Tarrytown
Pleasantville
left under
NY Albany I-87 6 NY 2/7 proposed
NY Long Island CR 97/Nicolls Rd NY 25 over
OH Columbus OH 161 Sunbury Rd proposed

OH

Columbus

I-270

20

Sawmill Rd

under
OK Tulsa I-244 11 Sheridan Rd left under
OK Tulsa I-244 12A Memorial Dr left under
ON St Catharines ON 406 4th Ave under
OR Salem I-5 256 OR 213
Market St
Silverton (NB)
Lancaster Mall (SB)
Over
PA Scranton US 6 5 PA 107 proposed
PA Scranton US 6 6 Meredith St proposed

PA

Pittsburgh

US 22

PA 66

Over

See a sketch

PA

Pittsburgh

PA 51

Liberty Ave (US 19 TRK/LR 3069)

Over

"leaf" loop in SW corner
opened 7-1-1999

Construction info, including great maps and sketches

PA

Philadelphia

I-76

40

South Street

All left ramps

Under

No protected left turn off the ramps

PA Philadelphia I-76/PA 291 43B (I-76 EB) Passyunk Ave (EB/SB)
Oregon Ave (EB/SB)
sort of (3/4 left SPUI on I-76, half normal SPUI on PA 291)
over on I-76, under on PA 291
PA Hazleton I-81 40 PA 924 SPUIed 6 ramp parclo

PA

Reading

US 222/422

US 222 SOUTH
Lancaster Avenue

All left ramps

Over

Poland
QLD (Australia) Melbourne NR 1 Oxenford Southport Rd under picture
SD Rapid City I-90 58 Haines Ave over UC
SD Sioux Falls I-229 6 I-229 BL/SD 38
10th Street
under
TN Memphis TN 14/Millington Rd TN 15 EAST
Stage Rd
James Rd
over
TN Memphis TN 23/Walnut Grove Rd TN 177
Germantown Pky
over
the first in TN
TN Memphis TN 23/Walnut Grove Rd Humphreys Blvd over proposed
TN Memphis I-40 10 TN 204/Covington Pike over proposed

TN

Nashville

TN 155

12

McGavock Pike
Opryland Hotel
Convention Center
Music Valley Dr

TN Memphis TN 176/Getwell Rd Winchester Rd over proposed
TN Johnson City I-181 (future I-26) 36 TN 381/State of Franklin Rd over UC

TN

Memphis

TN 385

Kirby Pkwy

over info about TN 385

TN

Memphis

TN 385

Riverdale Rd

over

TN

Memphis

TN 385

Winchester Rd

over

TN

Memphis

TN 385

Hacks Cross Rd

over

TN

Memphis

TN 385

Forest Hill Irene Rd

over

TN

Memphis

TN 385

Bailey Station Rd

over

TN

Memphis

TN 385

Byhalia Rd

half over
TN Memphis TN 385 US 72 over proposed
TN Memphis TN 385 TN 57 over proposed
TN Nashville TN 840 Mona Rd UC under
TX Ft Worth Beach St TX 180 under

TX

Dallas

I-30

46A

Central Expwy

3-level "volleyball" SPUI

TX

Houston

Main St

Holcombe Blvd

Under

Frontage

TX

Houston

Fannin St

Holcombe Blvd

Under

Frontage

UT Provo I-15 272 UT 265
Univ Pkwy
UC under

UT

Salt Lake City

I-15

293

UT 154

Bangerter Hwy

Under

Bridge decorated with Olympic theme

Opened 11-17-1998

UT

Salt Lake City

I-15

297

UT 151

10600 South

UC

Under

UT

Salt Lake City

I-15

298

UT 209

9000 South

UC

Over

UT

Salt Lake City

I-15

301

UT 48

7200 South

Over
Opened 11-8-1999

UT

Salt Lake City

I-15

303

UT 173

5300 South

UC

Over

UT

Salt Lake City

I-15

304

UT 266

4500 South

UC

Over

UT

Salt Lake City

I-15

306

UT 171

3300 South

UC

Over

UT

Salt Lake City

I-15

311

400 South

UC

Over

Only HOV left ramps to south

UT

Salt Lake City

I-15

312

600 North

Under

Opened 10-24-1998

on top
EB on top

UT

Salt Lake City

UT 201

17

900 West

UC

Over

UT

Salt Lake City

UT 201

14

3200 West

Over

UT

Salt Lake City

I-215

6

6200 So
Ski Areas
Solitude
Brighton
Snowbird
Alta

Over

EB aerial
EB at ground level

UT

Salt Lake City

I-215

21

California Ave

Over

VA Norfolk US 13 US 58 over

VA

Washington DC

US 50

VA 650
Gallows Rd
Merrifield

Under

VA

Washington DC

US 50

Fairview Park
Lee Hwy (EB)
US 29 (EB)

Under

Only 3/4 SPUI, no simultaneous left turns (so it basically functions as a normal 5-ramp parclo)

VA

Fredericksburg

I-95

North of Fredricksburg

VA Williamsburg VA 199 Monticello Ave over
VA Charlottesville US 250 Meadow Creek Pkwy Proposed
VA Newport News Hampton Roads Center Pkwy VA 134
Magruder Blvd
TO I-64 EAST (WB)
over
WA Seattle 4th Ave S S Atlantic St proposed over
no E-S access b/c Atlantic will be 1-way EB east of it
sketch (2nd picture on left side)

WA

Vancouver

I-5

5

NE 99th St

Over

WA

Vancouver

WA 14

1

SE Columbia Way (EB)
Columbia House Blvd

Over

WA

Olympia

US 101

Black Lake Blvd

Over

WA

Vancouver

WA 500

NE Andresen Rd

Over

WA

Tacoma

I-705

WA 509 NORTH
S 21st Street
Port of Tacoma

Under

WI

Milwaukee

I-94

308A

VA Center
County Stadium

3 left ramps, WB right exit not involved in the SPUI

Over

See Kurumi's info about SPUIs.
See the I-15 in Salt Lake City reconstruction homepage! They are using lots of SPUIs.
A Pittsburgh newspaper article about a new SPUI being built, including a young roadgeek holding his model of it
Please e-mail me if you have any additions or corrections.
Return to the SPUI Freeway.
Thanks to Russell Blau, Dan Stober (also some photos he took of the UT ones), Brad Davis, Tom Marney, CC Slater, Aaron M Renn, HB Elkins, Kevin Johnson, Brandon M Gorte, Chris Marysz, Ian Beverly, ADOT, Fred Tyner, Mark, Adam Froehlig, Alan Hamilton, Mike Pruett, Henning Maruhn, JDogg, V Reimer, Scott Johnson, Michael Torla, Tyler C Gruber, Jeff Kitsko, Anthony Boor, Ken Shook, Joey, Matt Salek, Bob Chessick, ARK, Bradley Torr, OCBruin, James Lin, Jeff Leadbeater, Steve Anderson, Mike Kitchen, Matt Steffora, John R Cambron, Pattie Suzore, Dave Chary, Gene Janczynskyi, Brian LeBlanc, Mike Moroney, Jason R Remy, Chris Lawrence, Scott Kozel, Jamie McIntyre, John Ingerslew, Tom Hawley, Chris Knight, Jon Persky, Billy Riddle, Nick Dubanow, Richie Kennedy, Lachlan Sims, James Moyer, Pat O'Connell, John Hobson, Peter Kaiser, highway@deja, Jonathan Sharp, Vinod Patel, Mikey for providing info.
Also thanks to the book Single Point Urban Interchange Design and Operation Analysis by the Transportation Research Board for info and pictures. A link to this book at amazon.com is here (not an affiliate link).