Interstate Mainline Deficiencies

 

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United States of America

Arkansas

Highway Location Deficiency type Comments Credit
I-40 North Little Rock single lane Westbound only. jl
I-55 West Memphis, at merge onto I-40 single lane Northbound only. ajf

District of Columbia

Highway Location Deficiency type Comments Credit
I-395 exit from Southwest-Southeast Freeway single lane Northbound only. ov

Florida

Highway Location Deficiency type Comments Credit
I-95 Jacksonville, junction with I-10 single lane Temporary: due to construction of new Fuller Warren Bridge. bb

Georgia

Highway Location Deficiency type Comments Credit
I-75 Macon, junction with I-16 single lane Southbound only. smc

Illinois

Highway Location Deficiency type Comments Credit
I-94 north of Chicago, east end of Edens Spur single lane Eastbound only. bb, mgk
I-39 Cherry Valley, at I-90 (Northwest Tollway) merge single lane pmj, mgk
I-39 Rockford, at west US 20 split single lane mgk
I-74 Moline, at I-80 single lane mc, mgk
I-74 and I-80 "bump" in Colona single lane mc, mgk

Indiana

Highway Location Deficiency type Comments Credit
I-80 Lake Station, at junction with I-90 (Indiana Toll Road) and I-94/US 6 single lane Eastbound only (???). I-80 exits I-94/US 6 and enters I-90. m329
I-74 Indianapolis, west end of I-465 overlap single lane I-74 joins I-465 at a cloverleaf. pmj, djg
I-74 Indianapolis, east end of I-465 overlap single lane I-74 joins I-465 at a cloverleaf. pmj, djg

Iowa

Highway Location Deficiency type Comments Credit
I-35 Des Moines, at I-80 ("Mixmaster") single lane mc

Louisiana

Highway Location Deficiency type Comments Credit
I-10 At I-110 single lane (eastbound only) Debatable violation, since I-10 technically has two lanes through the interchange, but drops the right lane at Washington St. ea

Kentucky

Highway Location Deficiency type Comments Credit
I-71 south end of I-75 overlap single lane Southbound only, exiting I-75. pmj

Maine

Highway Location Deficiency type Comments Credit
I-95 Portland, at both ends of Falmouth Spur single lane mjt

Massachusetts

Highway Location Deficiency type Comments Credit
I-95 south of Boston, at I-93 single lane mjt, map

Michigan

Highway Location Deficiency type Comments Credit
I-75 International Bridge, Sault St. Marie two-lane undivided roadway May not technically be part of I-75. mgk

Minnesota

Highway Location Deficiency type Comments Credit
I-35W near Forest Lake, merge with I-35E single lane Northbound only. mc
I-94 Lowry Hill Tunnel, Minneapolis substandard shoulders 2ft shoulders inside the tunnel ajf

Mississippi

Highway Location Deficiency type Comments Credit
I-59 Meridian, at merge into I-20 single lane Northbound only. ajf

Missouri

Highway Location Deficiency type Comments Credit
I-70 downtown St. Louis, at I-55/I-64 single lane Both directions to/from the Poplar Street Bridge. pmj
I-55 downtown St. Louis, at I-64/I-70 single lane Northbound going to the Poplar Street Bridge. smc
I-35 downtown Kansas City single lane At the exits from the I-35/70 overlap, I-35 traffic is reduced to a single lane. sr

Montana

Highway Location Deficiency type Comments Credit
I-90 Billings, at I-94 single lane Eastbound only. c470

Nebraska

Highway Location Deficiency type Comments Credit
I-80 At junction with I-76 Single lane Both directions through I-76 interchange. MTR

New Hampshire

Highway Location Deficiency type Comments Credit
I-93 Franconia Notch Parkway, White Mountains National Forest super-2 (two-lane undivided roadway) Strictly speaking, this is a gap in I-93. mm, rn

New Jersey

Highway Location Deficiency type Comments Credit
I-78 Jersey City, between New Jersey Turnpike Newark Bay Extension and Holland Tunnel surface street with signals and driveways Although not signed as such, I-78 runs east of the Turnpike Extension via 12th Street/14th Street and the Holland Tunnel. (Some have argued that this is not truly I-78.) djg

New York

Highway Location Deficiency type Comments Credit
I-278 Queens, at ramp between Brooklyn-Queens Expressway and Grand Central Parkway single lane djg, sa, mjt
I-278 (Brooklyn-Queens Expressway) Queens, at Northern Boulevard (NY 25A) single lane Westbound (southbound) only. mjt
TRUCK I-278 Queens, at Grand Central Parkway surface street I-278 runs briefly on the GCP between the Triboro Bridge and the Brooklyn-Queens Expressway. Since trucks are not permitted on parkways, they must use Astoria Boulevard, the GCP's service road. djg
I-678 Queens, at ramp from Van Wyck Expressway to Whitestone Expressway single lane sa
Queens-Midtown Tunnel (I-495) single lane The QMT has two tubes, each carrying two lanes. During rush hours, three lanes carry the dominant flow, leaving only one lane for the opposing traffic. sa
Brooklyn-Battery Tunnel (unmarked I-478) single lane The BBT has two tubes, each carrying two lanes. During rush hours, three lanes carry the dominant flow, leaving only one lane for the opposing traffic. bb4837, sa
I-95 Bruckner Interchange single lane Southbound only. Temporary, due to construction. mjt, map
I-87 Albany, at ramp from Northway to New York State Thruway single lane Southbound only. mjt
I-90 Berkshire Section of New York State Thruway, exit B1 single lane Follows ramps at a trumpet interchange. mjt, mgk
I-81 Thousand Islands Bridge two-lane undivided roadway smi, mm

Ohio

Highway Location Deficiency type Comments Credit
I-80 junction with OH 11 single lane Westbound only. pmj
I-77 Akron, junction with OH 8 single lane dse
I-670 junction with US 23 single lane Westbound only. sg
I-670 Columbus, at I-71 junction single lane Eastbound only. MTR
I-71 Columbus, south/west junction with I-70 single lane Northbound only. pmj, MTR

Oklahoma

Highway Location Deficiency type Comments Credit
I-44 Oklahoma City, west end of Turner Turnpike single lane Westbound only. smc
I-35 Oklahoma City, both I-40 junctions single lane smc

Pennsylvania

Highway Location Deficiency type Comments Credit
I-76 Valley Forge Interchange/PA Turnpike single lane Follows ramps at a trumpet interchange.  Westbound only? mjt, MTR
I-70 Breezewood surface street with signals and driveways I-70 runs on a few blocks of US 30 en route between the Pennsylvania Turnpike overlap and the freeway running south to Maryland. djg, sped
I-79 southeast junction with I-70 single lane Follows ramps at a trumpet interchange. mgk
I-70 New Stanton single lane djg, sped
I-83 East of Harrisburg, at I-283/PA 322 single lane Northbound only? MTR
I-83 west of Harrisburg, at PA 581 single lane Northbound only. mjt
I-279 Pittsburgh, between Ft. Pitt Bridge and Ft. Duquesne Bridge single lane Northbound only. jkk
I-676 Philadelphia, approach to Ben Franklin Bridge surface street with signals I-676 runs briefly on surface streets between the Vine St Expressway and the Ben Franklin Bridge.  There are 3 traffic signals eastbound and one traffic signal westbound. lp

Tennessee

Highway Location Deficiency type Comments Credit
I-75 Knoxville, at I-275/I-640 interchange single lane Southbound only. pmj, plh, hbe
I-40 downtown Memphis, at I-240 interchange single lane Eastbound only. plh
I-55 Memphis, at exit 12A-B (US 61/64/70/79) single lane Northbound traffic uses 20 mph loop. ajf

Texas

Highway Location Deficiency type Comments Credit
I-10 downtown San Antonio, at merge onto I-35 single lane Westbound only. plh

Virginia

Highway Location Deficiency type Comments Credit
I-64 Richmond, I-95 merge single lane Westbound only. sped

West Virginia

Highway Location Deficiency type Comments Credit
I-70 Wheeling Tunnel single lane There are two two-lane tubes, but only one lane in each tube carries I-70. Just west of the tunnel, the highway has only one lane in each direction. mf, mgk

Wisconsin

Highway Location Deficiency type Comments Credit
I-43 Greenfield, at Hale Interchange (west I-894 split) single lane mgk
I-94 downtown Milwaukee, at Marquette Interchange single lane mgk

Wyoming

Highway Location Deficiency type Comments Credit
I-180 Cheyenne:  I-80 to US 30 Surface road with at-grade intersections Special design exemption allows it to be signed as Interstate. ajf

Credits

Last updated on 11 March, 2007.

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