Longest Stretch of Road While Going "Straight"

[zzcarp]

I-76 (west) from its west beginning at I-70 in Arvada, Colorado to I-80 east in Nebraska (I-76 functions as the mainline through that interchange) to I-280 east in Des Moines to I-35 north to its terminus in Duluth (taking I-35W through Minneapolis) is 1,066 miles.

[STLmapboy]

The "Turnpike system," from the west end of the Chicago Skyway (I-90) all the way east to where the PA Turnpike extension meets the NJ Turnpike (I-90, I-90/80, I-80, I-76, I-76/70, I-76, I-276, I-95). 777 miles with no "turns" (but a high cost)

Got the 2 axle passenger vehicle toll fee for driving from Chicago's South Side to New Jersey via the Toll Roads?

Off-peak times, non-EZPass for all:
Skyway $5.60 https://www.chicagoskyway.org/toll-information/
Indiana Toll Road $12.00 https://www.indianatollroad.org/travel-information/#calculator
Ohio Turnpike $20.00 https://www.ohioturnpike.org/e-zpass/toll-rates
Penna Turnpike $65.70 https://www.paturnpike.com/toll/tollmileage.aspx

Total $103.30. And I believe there's an NJ Turnpike toll right on the other side of the Del River bridge.

[ilpt4u]

The "Turnpike system," from the west end of the Chicago Skyway (I-90) all the way east to where the PA Turnpike extension meets the NJ Turnpike (I-90, I-90/80, I-80, I-76, I-76/70, I-76, I-276, I-95). 777 miles with no "turns" (but a high cost)

Got the 2 axle passenger vehicle toll fee for driving from Chicago's South Side to New Jersey via the Toll Roads?

Off-peak times, non-EZPass for all:
Skyway $5.60 https://www.chicagoskyway.org/toll-information/
Indiana Toll Road $12.00 https://www.indianatollroad.org/travel-information/#calculator
Ohio Turnpike $20.00 https://www.ohioturnpike.org/e-zpass/toll-rates
Penna Turnpike $65.70 https://www.paturnpike.com/toll/tollmileage.aspx

Total $103.30. And I believe there's an NJ Turnpike toll right on the other side of the Del River bridge.

For one or two people, one can probably fly from ORD or MDW to PHL or TTN for that, and that is before factoring in fuel costs

I was trying to come up with a goofy routing starting in Tulsa on the Creek Turnpike, then following I-44 to Downtown STL and transitioning from I-44 east to I-70 west and ending at I-70's western termination to see if it would qualify. My biggest ?s would be where I-70 leaves the Kansas Turnpike and also I-70 in Downtown KC (both MO and KS).

[STLmapboy]

The "Turnpike system," from the west end of the Chicago Skyway (I-90) all the way east to where the PA Turnpike extension meets the NJ Turnpike (I-90, I-90/80, I-80, I-76, I-76/70, I-76, I-276, I-95). 777 miles with no "turns" (but a high cost)

Got the 2 axle passenger vehicle toll fee for driving from Chicago's South Side to New Jersey via the Toll Roads?

Off-peak times, non-EZPass for all:
Skyway $5.60 https://www.chicagoskyway.org/toll-information/
Indiana Toll Road $12.00 https://www.indianatollroad.org/travel-information/#calculator
Ohio Turnpike $20.00 https://www.ohioturnpike.org/e-zpass/toll-rates
Penna Turnpike $65.70 https://www.paturnpike.com/toll/tollmileage.aspx

Total $103.30. And I believe there's an NJ Turnpike toll right on the other side of the Del River bridge.

For one or two people, one can probably fly from ORD or MDW to PHL or TTN for that, and that is before factoring in fuel costs

My uncle once flew ORD-PHL on Frontier for $50 one way. That's less than PA's turnpike alone.

[DeaconG]

The Beachline-from the 407/528 split to west of the 417/528 interchange is a straight line. Straight shot from A1A to I-4.

[mrcmc888]

I-81 from its beginning at I-40 in Tennessee to its intersection with I-78 in Pennsylvania is a solid 500 miles.

[1995hoo]

I'm going to be a PITA here and suggest that a typical beltway around a major city would have the answer "Infinite".

A lot of beltways might not work as well as it appears at first glance, due to changes in alignment at major junctions and a varying number of through lanes in general.

You do have a point - that's why I said "a typical" and not "any" in my post   Also, recall that the OP did allow lane changes.

That said, the beltways I'm most familiar with are Baltimore's and Washington's.  I-695 is probably disqualified with the goofy alignment in the southeast quadrant near the Windlass Freeway.  I-495 could have issues with its merges with I-270, but that would be up to interpretation I think.

I've also clinched the beltways around Charlotte, Atlanta, and Jacksonville, but not enough times to know if they satisfy the criteria.

If changing lanes is allowed, the Capital Beltway would work. If changing lanes isn't permitted, you'd run into a problem on the Outer Loop approaching Springfield (this because when you pass the I-270 Spur, you land in the far right lanes, but then at Springfield the right HO/T lane and the leftmost two general-purpose lanes continue thru on the Beltway, while the rightmost three general-purpose lanes all exit to I-95 and I-395) and on the Inner Loop approaching the I-270 Spur (this because at Springfield the thru lanes on the Beltway become the HO/T lanes and the left two general-purpose lanes, and then at the I-270 Spur the three left lanes go to the Spur and the three right lanes stay on the Beltway).

[kphoger]

Off-peak times, non-EZPass for all:
Skyway $5.60 https://www.chicagoskyway.org/toll-information/
Indiana Toll Road $12.00 https://www.indianatollroad.org/travel-information/#calculator
Ohio Turnpike $20.00 https://www.ohioturnpike.org/e-zpass/toll-rates
Penna Turnpike $65.70 https://www.paturnpike.com/toll/tollmileage.aspx

Total $103.30. And I believe there's an NJ Turnpike toll right on the other side of the Del River bridge.

For one or two people, one can probably fly from ORD or MDW to PHL or TTN for that, and that is before factoring in fuel costs

My uncle once flew ORD-PHL on Frontier for $50 one way. That's less than PA's turnpike alone.

An overnight Greyhound bus between those cities, with one transfer at Indianapolis, can be had for less than $90 as well.

[Hot Rod Hootenanny]

I-76 (west) from its west beginning at I-70 in Arvada, Colorado to I-80 east in Nebraska (I-76 functions as the mainline through that interchange) to I-280 east in Des Moines to I-35 north to its terminus in Duluth (taking I-35W through Minneapolis) is 1,066 miles.

Or I-40 from Barstow to Okla City. 1200 miles.

[sparker]

If TOTSOs could be defined as situations where legally a blinker would be required, then there's a singular continuous route from the East Los Angeles (I-5, I-10, CA 60, US 101) interchange via NB I-5 to NB CA 99, NB CA 99 to NB CA 51 (Biz 80 be damned!), NB CA 51 to EB I-80, and then EB I-80 to I-15 in SLC, UT.  But that routing terminates at another long straight stretch: all of NB CA/I-15 from I-5 in San Diego onto WB I-84 in UT, with that route terminating at the I-86 merge (a blinker would be required to get on to the WB carriageway coming off I-86).

You can get from the Pacific Ocean at Seattle to at least Tomah, WI on I-90. And you wouldn't really need to use your blinker when merging onto I-94 at Tomah, so in that case you could get to Chicago.

If those same TOTSO rules applied here, that would disqualify the I-90 TOTSO east of Billings, MT; the through route would segue onto I-94 -- and then onto I-694 coming into the Twin Cities, at which point the straight line would segue onto SB I-35E and then back onto EB I-94 in downtown St. Paul.  From there it's simple: I-94 to I-90, I-90 into Chicago and, again, I-94 onto IL 394.  I'd consider the terminus the south end of the 394 freeway/expressway at the IL 1 merge.