I recall doing something similar to this in the past, but I couldn't find it, and I'm hoping this will be more comprehensive. For freeways only (no expressways, super 2's, etc.):
What freeway has the most consecutive grade separated road crossings with direct access provided (at least 2 exit/entrance ramps)?
I'll start with NY 104 in Irondequoit NY, 6 straight crossings with at least half-access between Lake Ave and Portland Ave.
And what freeway has the most consecutive crossings with NO direct access provided between the two roads?
The NYS Thruway between Exit 46 (I-390) and 47 (I-490) has 11 straight crossings with no access.
I think I-55 in Chicago has 7 crossings in a row with interchanges - IL 171, Harlem, Central, Cicero, Pulaski, Kedzie (half), and California (half). Depends if you want to count the Kedzie/California pair two interchanges or one.
There's a 25-mile stretch on I-88 (IL) between Dixon and Rochelle without any interchanges. If I'm counting correctly, there's 15 overpasses along that stretch.
I'm sure there's a viaduct somewhere that has more, but I'm struggling to think of one off the top of my head.
Might be off since looking via iPhone but I count 29 crossings between Somerset and Bedford on the Pennsylvania Turnpike.
Quote from: Mapmikey on July 02, 2024, 08:09:59 PMMight be off since looking via iPhone but I count 29 crossings between Somerset and Bedford on the Pennsylvania Turnpike.
I am counting 28; the discrepancy may be an unnamed road near MM 141 that is not visibly drivable from above and appears to be more of an unpaved dirt track than a public roadway, so I would not count that one for this exercise. Either way, an impressive entry that will be hard to top.
Interestingly, a considerable number of these crossings
do have access - but it's emergency access only, so I would count that as not having access for this exercise. These emergency access points seem to be much more common on the PA Turnpike than they are on the Thruway - perhaps due to the relative remoteness of the region, or because median U-turns are just a lot less practical on the Turnpike.
My guess is this would be more likely to happen on Turnpikes and Tollways.
The Kansas Tpk has 17 crossings between US 56 and I-35 at Emporia.
My immediate thought was the long stretch on the Mass Pike between old exits 2 in Lee and 3 in Westfield. I count 18 for that stretch, plus the Appalachian Trail foot bridge.