Longest stretch of 6 lanning, 8 lanning, 10 lanning

[jdb1234]

In Alabama, I-65 is 6 lanes from Exit 242 in Pelham to just south of Exit 291 for a distance of about 50 miles.

[newyorker478]

95 is at least six lanes from Wilmington DE up to New Haven [i belive![

also the long island expressway, I-495, is sixlaned its entire 73 mile length from the midtown tunnel to riverhead.

[NE2]

95 is at least six lanes from Wilmington DE up to New Haven [i belive![

This has been mentioned in more detail earlier in the thread...

[txstateends]

What about Houston's Katy and Southwest Freeways?

According to Erik's pix:  http://www.houstonfreeways.com/i10_photo_report_westbound.html

Most of I-10 (Katy Frwy.) from I-610 to TX 6 is 10 lanes, not counting the 4 HOT lanes or the service roads.  There are some 8 or 12-lane portions, but those are at exits.  One service road Erik found west of TX 6 is 4 lanes wide for the WB one (I'm guessing the same EB); he doesn't show any close up east of TX 6 and west of I-610, but I'm guessing at least 3 lanes average on those.  He doesn't have any more pix west of TX 6 so I don't know the widths to the west, nor how far the newly-redone part goes (to see how many lanes there are).

[roadman65]

When the widening project on the NJ Garden State Parkway is completed soon, it will be over 100 miles of 3 or more lanes.   The first phase will be from Exit 63 to Exit 163 if it has not been widened more in the Paramus area in the past twenty years. True, it does not compare to I-95, but for New Jersey that will be the longest stretch.

[SSOWorld]

What about 10 lanes? The longest stretch I know of is the Borman in NW Indiana... I think it's 10 lanes all the way from I-94/IL-394 to I-65

Even if it's not, the Borman would be part of the longest 8-lane stretch I know of, going from the Indiana E-W Toll Road (or I-65, I don't remember which) into Illinois and along the Tri-State Tollway to IL-173 at a distance of about 90 miles. The 6-laning goes another 60 miles east to Benton Harbor, Michigan and I would assume as far as Milwaukee, meaning 200+ miles of 6 lanes

When done, there will be 8 lanes all the way to the Milwaukee Airport (considering about 2 miles in IL between US 41 and the Waukegan Toll is STILL 6 lanes - not sure but I think they extended it further north but not all the way)

[cpzilliacus]

How many lanes are on the stretch of I-95 from Washington to Boston?

IIRC, it's eight lanes from the Capital Beltway to Wilmington, four lanes through the city of Wilmington to the I-495 split, then six lanes to the Blue Route, then eight lanes through Philly to Woodhaven Rd (PA 63), then six lanes to Bristol at PA 413, then back to four lanes.

There is at least one (short) section of I-95 in Baltimore City, north of the Fort McHenry Tunnel toll plaza that is six lanes. 

And there's a longer section of I-95 (JFK Highway) in Maryland in Harford and Cecil Counties that is six lanes, from Exit 77 (Md. 24, Edgewood) to the Delaware line. In Delaware, it's six lanes between the Maryland line and the Delaware Turnpike toll plaza, and then 8 lanes (or more) from there to the I-95/I-295/I-495 interchange.

[NE2]

There is at least one (short) section of I-95 in Baltimore City, north of the Fort McHenry Tunnel toll plaza that is six lanes. 

And there's a longer section of I-95 (JFK Highway) in Maryland in Harford and Cecil Counties that is six lanes, from Exit 77 (Md. 24, Edgewood) to the Delaware line. In Delaware, it's six lanes between the Maryland line and the Delaware Turnpike toll plaza, and then 8 lanes (or more) from there to the I-95/I-295/I-495 interchange.

Yes, we've been over this: https://www.aaroads.com/forum/index.php?topic=4898.msg109519#msg109519

[r-dub]

In Colorado, I-25 is a minimum of 6 lanes from MM 180 to around MM 243. 64 miles total.

It's 8 lanes from the north end of Castle Rock to C-470 (10 miles) minus one <1 mile 6 lane stretch at the new RidgeGate exit.
It's 10 lanes wide from C-470(MM 194) to I-225(MM 200), then back down to 8 until Lincoln Ave(MM 207), then 6 through the Santa Fe/US 85 interchange, which is under construction to remove the bottleneck.
After Santa Fe, it's 8 lanes through downtown Denver, then drops back to six at the US 36 turnoff (MM 217). It stays 6 until after the far northern reaches of Denver.

I-70 is six lanes from Colfax Avenue on the east (MM 288) all the way into the mountains until the base of Floyd Hill and the US 6 interchange (MM 246 westbound, MM 248 eastbound). WB 70 loses the third lane early due to terrain issues on its long downhill. 40 miles total. The worst part of this is that in the Mousetrap interchange with 25, 70 could be six lanes since the roadway is wide enough, but it's only striped as 4.

Any other 6+ laning in Colorado is few and far between.

[roadman65]

I forgot about the Driscoll Bridge in New Jersey on the Garden State Parkway now being the widest highway bridge in the world.  It has, from what I read, 14 or 15 lanes across.

[2Co5_14]

I-80 is at least 6 lanes between San Francisco and Applegate, CA, a distance of 127 miles (56 of those miles are 8 lanes or more).  There are 2 lane transition ramps in West Sacramento, but if you include the lanes of Business 80 (which follows the original routing of I-80), it works.  Otherwise, it's only 81 miles.

The longest 3-di with 6 continuous lanes I can think of is I-495 between Raynham and Amesbury, MA, a distance of 100 miles.

[OCGuy81]

What about I-405 in California? I make it a point not to drive it in LA County unless heading to LAX, but it doesn't seem to drop too much in lane count for the entire route.

[Daniel Fiddler]

I-75 from the Florida Turnpike to Exit 11 (Ooltewah) in Tennessee is 6+ lanes save for the section near Macon where I-475 is 6-laned instead, and once Florida's current project is completed, it will be 6+ lanes down to at least Venice if not Naples.

I-65 is either already widened or is in the process of being widened to at least 6 lanes from the Tennessee state line to the Indiana state line (across the Ohio River bridge in Louisville).

I-95 is 6+ lanes from downtown Miami to Fort Pierce, and from Daytona Beach to Savannah.

I-4 is 6+ lanes from Tampa to Sanford.

I-285 is 8+ lanes for it's entire 61 mile length around Atlanta.

Not as impressive as the others, but I-40 is 6+ lanes from I-75 south (toward Chattanooga) to I-81.

For some reason, I'm thinking I-85 from Anderson, SC to Concord / Kannapolis, NC and from High Point to Durham are both 6+ lanes, but I could be mistaken about them, it's been a while since I've been on those stretches of road.

[NE2]

I don't know if I've posted this link, but it should help: http://www.itoworld.com/product/data/ito_map/main?view=128&lat=34&lon=-90&zoom=6
Red=2, green=4, blue=6, purple/yellow=more

[vtk]

I don't know if I've posted this link, but it should help: http://www.itoworld.com/product/data/ito_map/main?view=128&lat=34&lon=-90&zoom=6
Red=2, green=4, blue=6, purple/yellow=more

I think you have.  The problem is an 8 lane freeway looks just like a 4 lane undivided road.  (Wouldn't be a problem if the lanes=* tag in OSM referred to minimum thru lanes each direction, rather than total both directions...)

[NE2]

The problem is an 8 lane freeway looks just like a 4 lane undivided road.

No it doesn't. That rendering processes oneway tags.

[BlueNacho]

http://g.co/maps/yaq8e

After ISHTA (I think I got the abreviation right) widens I-90 to six lane from Elgin to Rockford, it should be six lanes for I-94/I-80 near Gary, IN to County Highway 9 near Beloit, WI. for a total of 126 miles. Correct me if I'm wrong or missed a 4-lane segment.

[Bigmikelakers]

What about I-405 in California? I make it a point not to drive it in LA County unless heading to LAX, but it doesn't seem to drop too much in lane count for the entire route.

The 405's length is about 72 miles. I know theres some confusion with I-10 due to the East LA Interchange but isn't the 405 the longest 10 lane highway? At minimum it has to be by far has to be the longest non mainline Interstate with at least 6 or even 8 lanes for that matter.

[DeaconG]

The six laning on I-95 between SR 528 in Cocoa and CR 514 in Palm Bay is complete (and may I say it is an immense relief).  The six laning between SR 528 and SR 406 in Titusville is in work through mid-2013.

[UptownRoadGeek]

What about I-405 in California? I make it a point not to drive it in LA County unless heading to LAX, but it doesn't seem to drop too much in lane count for the entire route.

The 405's length is about 72 miles. I know theres some confusion with I-10 due to the East LA Interchange but isn't the 405 the longest 10 lane highway? At minimum it has to be by far has to be the longest non mainline Interstate with at least 6 or even 8 lanes for that matter.

Not exactly an interstate, but once construction is complete Beltway 8 in Houston will be almost 88 miles of 6 lanes. I-285 in Atlanta would come in 3rd.

[brownpelican]

I-10 is at least six lanes from Slidell (I-12/I-59) to I-310...47 miles.

[broadhurst04]

I like Georgia's six lanning of I-75 and I-95. South Carolina and North Carolina are a joke with their treatment of I-95.

I-95 in NC hasn't been touched since it was built because it doesn't pass through any of the state's 5 largest cities. Same with SC.

[mightyace]

^^^

I guess if PA was like NC, then I-80 wouldn't get much done on it.

[agentsteel53]

What about I-405 in California? I make it a point not to drive it in LA County unless heading to LAX, but it doesn't seem to drop too much in lane count for the entire route.

I think we might have a winner.  I-5 from San Ysidro, then the entire I-405 (as there are three lanes, at least, for both the south and north junctions, for the transitions in each direction), then I-5 again to the US-99 split.  228 miles of six-lane freeway.

it would be even longer, if not for the fact that the 99 SB to 5 SB transition drops to two contiguous lanes.  If we count the truck lanes (two lanes) and the car lanes (two more) as valid, despite being non-contiguous, then I believe CA-99 is six lanes all the way to somewhere past Bakersfield, which is a whopping 253 miles or more!

[NE2]

I believe CA-99 is six lanes all the way to somewhere past Bakersfield, which is a whopping 253 miles or more!

It drops to 4 at Delano.

Switching to US 101 doesn't get you as far - only Carpinteria.