Interstate one lane mainlines

[vdeane]

I believe I-95 south in the Bruckner interchange in NYC has a one lane portion.

[mtantillo]

I believe I-95 south in the Bruckner interchange in NYC has a one lane portion.

It is very short but it counts.  I-95 squeezes to one lane after the split and exit for I-278 and I-678.  Then a lane joins on the left from I-678 to make 2 lanes, and 2 lanes join on the left to make 4 lanes, and then the right lane ends (the one coming from I-95!) to make 3 on the Cross Bronx. 

[Mergingtraffic]

I believe I-95 south in the Bruckner interchange in NYC has a one lane portion.

It is very short but it counts.  I-95 squeezes to one lane after the split and exit for I-278 and I-678.  Then a lane joins on the left from I-678 to make 2 lanes, and 2 lanes join on the left to make 4 lanes, and then the right lane ends (the one coming from I-95!) to make 3 on the Cross Bronx. 

Excellent planning, they took a page out of the CT planning book.

[NE2]

Southbound on I-83 at PA 581, one has to exit the mainline to the right to continue on I-83 (through a single-lane trumpet interchange). The mainline continues west with two lanes as PA 581.

Unless this has changed recently, it's two lanes southbound.

[NE2]

Here's a mostly-complete list (not counting the end of a route, and not counting cases where there is more than one roadway in the same direction e.g. local and express lanes):
On a freeway mainline
*I-8 east at I-5, San Diego, CA
*I-70 west at I-695, Baltimore, MD (practically the end)
*I-81 south at I-690, Syracuse, NY
*I-81, Thousand Islands Bridge, NY
*I-93, Franconia Notch, NH
*I-394 west at I-94, Minneapolis, MN
*I-670 east at I-35, Kansas City, MO
*I-705 north at SR 509, Tacoma, WA

On a ramp (broadly defined)
*I-10 at I-35/US 90, San Antonio, TX
*I-15 south at I-84, Tremonton, UT
*I-15 at I-90, west of Butte, ID
*I-15 at I-90, Butte, ID
*I-24 east at I-65, northern Nashville, TN
*I-26 (future) at I-240, Asheville, NC
*I-29 south at I-35, Kansas City, MO (practically the end)
*I-35 at I-40, downtown Oklahoma City, OK
*I-35 at I-335, Emporia, KS
*I-35 at I-70, Kansas City, MO
*I-35 at I-70/US 71, Kansas City, MO
*I-35 at I-80/I-235, northern Des Moines, IA
*I-39 at US 20, Rockford, IL
*I-39 at I-90, Rockford, IL
*I-40 east at I-55, West Memphis, AR
*I-40 east at I-240, downtown Memphis, TN
*I-40 at I-240, eastern Memphis, TN
*I-43 at I-894, southwest of Milwaukee, WI
*I-44 at SH 74, northwestern Oklahoma City, OK
*I-44 at I-35, northeastern Oklahoma City, OK
*I-55 at I-240, Memphis, TN
*I-55 at Crump Boulevard, Memphis, TN
*I-55 at I-64/I-70, St. Louis, MO
*I-64 at I-81, Lexington, VA
*I-64 at I-81, Staunton, VA
*I-64 at I-95, Richmond, VA
*I-66 at US 50, Washington, DC
*I-69 at I-55, Hernando, MS
*I-69 east at I-96 (north junction), Lansing, MI
*I-69 at I-94, Port Huron, MI (practically the end)
*I-70 east at Fairfax Trafficway, Kansas City, KS
*I-70 east at I-35/US 71, Kansas City, MO
*I-70 at I-670/US 71, Kansas City, MO
*I-70 at I-55/I-64, St. Louis, MO
*I-70 at WV 2, Wheeling, WV
*I-70 at I-76, New Stanton, PA
*I-70 west at I-76, Breezewood, PA
*I-71 south at I-75, Walton, KY
*I-71 at I-70/SR 315, Columbus, OH
*I-72 at I-55, eastern Springfield, IL
*I-73 north at I-85, Greensboro, NC
*I-74 at I-280, Moline, IL
*I-74 at I-80, Colona, IL
*I-74 at I-55, Normal, IL
*I-74 at I-465, western Indianapolis, IN
*I-74 at I-465, eastern Indianapolis, IN
*I-74 west at I-275 (east junction), northwest of Cincinnati, OH
*I-75 at I-275/I-640, Knoxville, TN
*I-76 at I-277, Akron, OH
*I-76 at I-77 (west junction), Akron, OH
*I-76 at I-80, Austintown, OH
*I-76 west at I-276, Valley Forge, PA
*I-76 east at PA 291, Philadelphia, PA
*I-77 at I-81, Fort Chiswell, VA
*I-77 at I-76 (east junction), Akron, OH
*I-79 at I-70 (west junction), Washington, PA
*I-79 at I-70 (east junction), Washington, PA
*I-80 east at I-76, Big Springs, NE
*I-80 at I-74, Colona, IL
*I-80 at I-90/I-94, Portage, IN
*I-80 east at I-76, Austintown, OH
*I-83 north at PA 581, Lemoyne, PA
*I-83 at I-283, Harrisburg, PA
*I-84 at I-86, Burley, ID
*I-84 west at I-15, Ogden, UT
*I-87 south at I-90, Albany, NY
*I-90 at I-94, Billings, MT
*I-90 at I-80, Elyria, OH
*I-90 at SR 2, Elyria, OH
*I-90 at Berkshire Thruway, southeast of Albany, NY
*I-94 west at I-43/I-794, Milwaukee, WI
*I-94 east at US 41, Glencoe, IL
*I-95 at PA Turnpike extension, Mansfield, NJ
*I-95 south at I-278/I-295, Bronx, NY
*I-95 north at I-93, Canton, MA
*I-185 at I-85, Greenville, SC
*I-215 north at SR 60/SR 91, Riverside, CA
*I-278 at I-95, Elizabeth, NJ
*I-278 at Grand Central Parkway, Queens, NY
*I-278 east at I-87, Bronx, NY
*I-279 north, downtown Pittsburgh, PA
*I-293 at NH 101/Everett Turnpike, Manchester, NH
*I-295 south at DC 295, Anacostia, DC
*I-376 at US 422, New Castle, PA
*I-395 north at I-695, Washington, DC
*I-410 CW at I-35 (north junction), San Antonio, TX
*I-410 CCW at I-35 (south junction), San Antonio, TX
*I-435 at I-29 (north junction), north of Kansas City, MO
*I-435 CCW at I-29 (south junction), north of Kansas City, MO
*I-470 at I-335, Topeka, KS
*I-475 south at US 23, west of Toledo, OH
*I-480 west at I-271/US 422, Bedford Heights, OH
*I-496 east at US 127, Lansing, MI
*I-540 at I-40, Van Buren, AR
*I-540 at I-40, Alma, AR
*I-676 west at 8th Street, Philadelphia, PA
*I-680 at I-29, Crescent, IA
*I-680 at I-29, Missouri Valley, IA
*I-787 south at NY 7/NY 787, Troy, NY
*I-790 east at NY 49, Utica, NY
*I-820 CW at SH 121/SH 183, northeast of Fort Worth, TX

[mgk920]

Here's a mostly-complete list (not counting the end of a route, and not counting cases where there is more than one roadway in the same direction e.g. local and express lanes):
On a ramp (broadly defined)

*I-39 south at I-90/I-94, Portage, WI

I-39 is two-lanes in both directions through the Cascade interchange (I-90/94 split) near Portage, WI.

Mike

[NE2]

You're right - it looked like one on aerials.

[ftballfan]

I-96 WB at Alpine Ave in Comstock Park, MI is one lane for a short while.

[InterstateNG]

I-96 WB at Alpine Ave in Comstock Park, MI is one lane for a short while.

Looks to be clearly two lanes.

[NE2]

The right lane is exit only, but the exit comes after another lane merges in on the left from US 131 north. A single white line appears between the lanes before the left entrance, but since you're allowed to cross the line ("not recommended" in Michigan) it's two lanes. Unless you want to call any one-lane ramp that becomes an exit only lane zero lanes...?

[mgk920]

Westbound I-94 narrows to one lane as it passes through the rebuilt Marquette Interchange in Milwaukee.  Before the rebuild, it was one lane through that interchange in both directions.

Mike

[SSOWorld]

Here's a mostly-complete list (not counting the end of a route, and not counting cases where there is more than one roadway in the same direction e.g. local and express lanes):


On a ramp (broadly defined)
*I-61 at I-81, Lexington, VA

I hope you mean I-64.

I-90 WB to Dan Ryan (I-90/94) NB in Chicago, Actually 2 one lane ramps - 1 to the express lanes one to the local lanes.  I can understand why this isn't counted, but it's close since one cannot pass.  Also at the Edens Junction, the Reversible entry/exit lanes to/from the Edens and Kennedy mainline are single-lane, but I definitely wouldn't count those since they're just a split lane.

[NE2]

Westbound I-94 narrows to one lane as it passes through the rebuilt Marquette Interchange in Milwaukee.  Before the rebuild, it was one lane through that interchange in both directions.

Mike

Ah yes. The two-lane ramp narrows to one. Added.

[InterstateNG]

The right lane is exit only, but the exit comes after another lane merges in on the left from US 131 north. A single white line appears between the lanes before the left entrance, but since you're allowed to cross the line ("not recommended" in Michigan) it's two lanes. Unless you want to call any one-lane ramp that becomes an exit only lane zero lanes...?

My thoughts exactly.

[Brandon]

Here's a mostly-complete list (not counting the end of a route, and not counting cases where there is more than one roadway in the same direction e.g. local and express lanes):
On a ramp (broadly defined)

*I-39 south at I-90/I-94, Portage, WI

I-39 is two-lanes in both directions through the Cascade interchange (I-90/94 split) near Portage, WI.

Mike

IIRC, it is also 2 lanes in each direction now at the Cherry Valley Interchange in Rockford since the rebuild.