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[ftballfan]

I-96 is six lanes between Exit 133 and Detroit, a distance of nearly 60 miles.

[Revive 755]

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

There's a short eight lane stretch in Wisconsin south of WI 50, otherwise I-94 is indeed six lanes into the Milwaukee area.

Long term, the Tri-State/I-94 corridor is supposed to be eight lanes all the way into the Milwaukee area.  Rumor has it the northern end of the Tri-State near IL 173 will be widened in the next year or two.

[JREwing78]

In addition, in Wisconsin the I-39/90/94 corridor from Portage south to Madison is 6-laned, as well as a 5-mile stretch of I-94 east of Madison.

Plans are afoot to 6-lane the I-39/90 stretch between Madison and Beloit. That would make for a 95 mile continuous stretch of 6 or 8-lane interstate from Portage, WI to Rockford, IL. Once I-90 is 6-laned over the existing 4-lane stretch from Rockford to the Chicago suburbs, you would have a continuous 6-lane or more stretch for over 275 miles, between Portage, WI and Benton Harbor, MI.

[Stephane Dumas]

Hwy 401 seems to have lots of 6-lanes section between Oshawa and Windsor.

[Chris]

The longest 10 lane-section is probably on Interstate 10 from Santa Monica towards San Bernardino. Another long wide section is the New Jersey Turnpike once the widening is completed.

There are several 100+ mile sections of six-lane freeways in Europe, especially in France, Italy, Germany and the United Kingdom.

Algeria has a 1250 kilometer (780 mile) freeway that has six lanes throughout the country.

[agentsteel53]

I-10 and I-5 both drop to two lanes in the East LA Interchange, I believe.

[vtk]

I don't think TN has plans in place to continue the six-laning of 65 down to Goodlettsville or 75 down to Knoxville, but it wouldn't be easy for them to do so.  65 has a short dicey stretch between Millersville and Ridgetop that would need a bit of blasting, and 75 has Jellico Mountain.

I don't think that's the actual name of that mountain.  However, I'm fairly certain anyone who's driven that stretch of I-75 more than once will know exactly which mountain you're referring to.  Perhaps the mountain should be renamed.

[6a]

I don't think that's the actual name of that mountain.  However, I'm fairly certain anyone who's driven that stretch of I-75 more than once will know exactly which mountain you're referring to.  Perhaps the mountain should be renamed.

The mountain running along 75 is Pine Mountain, although there is a Jellico Mountain very near there to the west of the town of Jellico.

[Landshark]

I-5 is 6 lanes from Vancouver, WA, to Exit 55.  Eventually, it will be 6 lanes from Portland to Seattle.

It is 6 lanes from exit 88 to exit 224 (136 miles)  on I-5 in Western Washington.  Currently WSDOT is widening I-5 between Chehalis and Grand Mound (exit 88).  Eventually I-5 will be at least 6 lanes through the entire state.

[Bickendan]

Inclusive of up to Blaine and onto BC 99?
Now, if Portland would do something about the 4-lane segment on the Eastbank Freeway, I-5 could be six-laned from Salem to the border (and eventually, from I-105 north... oh, wishful thinking!).

[nexus73]

Inclusive of up to Blaine and onto BC 99?
Now, if Portland would do something about the 4-lane segment on the Eastbank Freeway, I-5 could be six-laned from Salem to the border (and eventually, from I-105 north... oh, wishful thinking!).

Since the reconstruction of the I-5/58 interchange, there is a brief segment of 3 lanes northbound on I-5.  Also, take note that the McKenzie River I-5 bridges are built to handle 3 lanes each and that the currently under construction Willamette River I-5 bridges will be 3 lanes per bridge when they are complete.  This suggests that I-5 gets 6-laned from I-5/58 to perhaps Coburg.

My preference would be for I-5 in Oregon to be 6-lane down to Cottage Grove since that city is a traffic generator.  Going south I would 6-lane the Umpqua Valley area (Sutherlin to Myrtle Creek) and the Rogue Valley area (Grants Pass to Ashland) with 5-lane sections for all uphill grades in the countryside.  California has done a fine job with the 5-lane setup on I-5 north of Redding and they have a section of 6-lane in the Redding area already that could tie in well with the rest of the freeway heading south to Sacramento. 

Rick

[MeanMeosh]

Some others:

IH-10 has 6+ from the CA-86S expressway in Indio all the way to its terminus, and 8+ from Yucaipa to the 405, though it may narrow to 2 through lanes temporarily at one of the downtown L.A. interchanges.  IH-15 is also 6+ from its terminus to IH-40 in Barstow, a whopping 185 miles.

IH-45 will soon have 8+ continuously from League Line Road in Conroe to at least NASA Road 1 (66 miles - though not sure where the 8-laning ends now, exactly), and 6+ from the Walker/Montgomery County Line to its terminus in Galveston (approx. 102 miles), once construction is complete from Conroe northward.  If you count IH-45 and US-75 as a single highway, it has 6+ continuously from the north end of the Corsicana bypass to TX-121 south of McKinney, for a total of 79 miles. 

IH-35 is also 6+ continuously from Exit 280 in Bell County to IH-410 south of San Antonio, or 135 miles, if you count the "express" and "local" lanes in Austin as 4 combined lanes in each direction.  Expansion is currently in progress to Belton, so counting the 6-lane segment south of Temple, you'll have a total of 151 miles of 6-laned freeway for your driving pleasure.  Or not, considering how awful traffic is on 35 through Austin.

[golden eagle]

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

[NE2]

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

None through central New Jersey

[1995hoo]

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

Varies. But there are stretches in Delaware and Pennsylvania that have two lanes on each side (four lanes total).

[agentsteel53]

95 drops to one lane at 93 in Canton, MA.  in fact, it is a cloverleaf, exiting itself.

[warderjack]

Now, if Portland would do something about the 4-lane segment on the Eastbank Freeway, I-5 could be six-laned from Salem to the border (and eventually, from I-105 north... oh, wishful thinking!).

Since the reconstruction of the I-5/58 interchange, there is a brief segment of 3 lanes northbound on I-5.  Also, take note that the McKenzie River I-5 bridges are built to handle 3 lanes each and that the currently under construction Willamette River I-5 bridges will be 3 lanes per bridge when they are complete.  This suggests that I-5 gets 6-laned from I-5/58 to perhaps Coburg.

My preference would be for I-5 in Oregon to be 6-lane down to Cottage Grove since that city is a traffic generator.  Going south I would 6-lane the Umpqua Valley area (Sutherlin to Myrtle Creek) and the Rogue Valley area (Grants Pass to Ashland) with 5-lane sections for all uphill grades in the countryside.  California has done a fine job with the 5-lane setup on I-5 north of Redding and they have a section of 6-lane in the Redding area already that could tie in well with the rest of the freeway heading south to Sacramento. 

Rick

It does appear that ODOT is having some foresight by making the recently reconstructed interchange with OR 58 wide enough to accommodate six-lanes, as well as the new bridge over the Willamette. Also, just north of Eugene a recently replaced bridge going over some minor stream/creek is clearly built with six-lanes in mind as well. If they six-laned it from south of Eugene up to Coburg, that would be great for game days at the University of Oregon, but it would still mean a huge bottleneck once I-5 choked back down to 4-lanes. I think long term, we will see six lanes extending south from Salem to Albany/to OR 34, and eventually meeting with six-lane roadway coming up from Eugene. My guess is that this will take something on the order of 20-30 years.

Still, these areas don't need the extra lanes nearly as badly as OR 217 does. They are building add/drop lanes and long exit only lanes, but the lack of a consistent third lane each way forces a lot of weaving. This highway is majorly underpowered for what it's being asked to do. I would even be willing to argue that OR 217 needs to be six laned the whole way, even more so than the East Bank Freeway in Portland. Don't get me wrong that whole mess needs to be rebuilt and modernized with more appropriate geometries, but that area isn't growing; Washington County is.

[nexus73]

Wanderjack, I think 217 should be an 8-lane freeway given it's urban nature.  PDX is so far behind the curve when it comes to freeways.

Rick

[DeaconG]

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.  Beyond that, dunno-never been north of Noo Yawk that way

EDIT: Can't remember offhand if the Girard Point Bridge is six or eight lanes-I think it's six, but don't hold me to it-haven't been home in two years.

[Bickendan]

Wanderjack, I think 217 should be an 8-lane freeway given it's urban nature.  PDX is so far behind the curve when it comes to freeways.

Rick

You have to remember that part of being being the curve is deliberate.

[Interstate Trav]

I-10 and I-5 both drop to two lanes in the East LA Interchange, I believe.

They do, but only as they transition onto another freeway.  does that count as loosing there lanes?

[NE2]

I-95 has the following minimum lane count north of North Carolina:
*4 to I-85
*6, I-85 to VA 123, except 5 (2 northbound) through I-295 interchange
*8, VA 123 to MD 24, except:
**4 through Springfield Interchange
**6 in Virginia (still under construction)
**5 at north I-495 split (2 southbound)
**6 through I-395 interchange
**6 through unbuilt I-83 interchange
**6 from Moravia Road to I-895
**6 through I-695 interchange
*6, MD 24 to Delaware toll
*8, Delaware toll to I-295
*4 through I-295 interchange
*6, I-295 to downtown Wilmington
*4, downtown Wilmington to I-495
*6, I-495 to I-476
*8, I-476 to PHL, except 6 through PA 420 interchange
*6, PHL to Girard Avenue
*8, Girard Avenue to Betsy Ross Bridge
*6, Betsy Ross Bridge to PA 413
*4, PA 413 to NJ 29
*6, NJ 29 to gap

Restarting along I-295 in Delaware to the NJ Turnpike:
*4, I-95 to US 13
*8, US 13 to I-295/NJTP split
*4, I-295/NJTP split to NJ 73
*6, NJ 73 to split south of NJ 32 (being widened north of PA Turnpike)
*10, split south of NJ 32 to NJ 18
*12, NJ 18 to GSP
*14, GSP to I-278
*12, I-278 to NJ 3 (6 along each spur)
*10, NJ 3 to US 46 (4 along west spur)
*6, US 46 to I-80
*10, I-80 to
*14 over GWB
*8, GWB to I-87
*6, I-87 to Cedar Street Branford, except:
**3 through Bruckner Interchange (1 southbound)
**5 through I-695 interchange (2 northbound)
**8 from I-695 to Pelham Parkway
**4 through I-91 interchange (will it be 6 after construction?)
*4, Cedar Street Branford to RI 4 (widens to 8 over Connecticut River and 10 over Thames River)
*8, RI 4 to I-195
*6, I-195 to MA 9, except 3 (1 northbound) through I-93 interchange
*8, MA 9 to I-93
*6, I-93 to MA 128
*4 through MA 128 interchange
*6, MA 128 to US 1 connection
*8, US 1 connection to MA 133
*6, MA 133 to I-495
*8, I-495 to NH 16
*6, NH 16 to I-295
*4, I-295 to Canada

So, except for temporary drops through interchanges, I-95 is at least 6 lanes from Petersburg to Wilmington, at least 8 from south of DC to north of Baltimore, at least 6 from north of Wilmington to New Haven (once the PA Turnpike connection is complete), and at least 6 from south of Providence to Portland. I-495 around Wilmington is six lanes except at the north end, so the only significant gap in 6 lanes from Petersburg to Portland is through Connecticut and Rhode Island. And that part can be bypassed by using I-91, I-84, and I-90, which is practically all 6+ lanes.

In short, when the I-95 gap is filled, there will be a six-lane corridor from Petersburg, VA to Portland, ME, excepting short logical lane drops through interchanges. This is longer than the I-75 six-laning between Florida's Turnpike and Chattanooga (which also has at least one such drop, at Macon).

[vdeane]

There's some illogical lane drops through interchanges too.

[aridawn]

Well ON-401 currently will be 6 lanes from just west of London, to Cobourg, ON by summers end as they finish up a section of 6 laning just west of Kitcher/Waterloo. There is a section from ON-3 to Tilbury, ON on the western end of the freeway, and a short new stretch in Kingston. Both of these two are still under construction and are apart of along term plan to 6 lane the entire freeway all 827km. As for 8 lanes 401 is 8 lanes from Hurontario Rd to ON-410(currently being upgraged to express/collector system), and Brock Rd to Salem Rd,(4 miles a piece) and two sections of 12-16 lanes across the top of Toronto on Four carriageways of three to four lanes a carriageway. No planes to marry the two sections of express/collector systems together as yet.

[UptownRoadGeek]

What about Houston's Katy and Southwest Freeways?