Monotube Gantries

[SkyPesos]

I don't see any monotubes on a GSV look on I-94 in downtown Detroit. So I think that makes it the longest interstate without monotubes, with the second and third longest to be I-20 and I-55 to the best of my knowledge. Someone can correct me on either (or both) if necessary.

On second thought, do these monotubes used for open road tolling on I-94 count, or does a BGS have to be attached to one?

[MATraveler128]

The only examples of monotube gantries in Massachusetts are all in Boston.

Here's an example on the Mass Pike at Exit 134

https://www.google.com/maps/@42.3464337,-71.0617479,3a,75y,106.56h,72t/data=!3m6!1e1!3m4!1s1b3SBwXUd1M8gy2RjEXbFQ!2e0!7i16384!8i8192

Exits 135 and 137 also have them as well as on I-93 north leaving the Tip O'Neill Tunnel and around Andrew Square southbound.

[bing101]

I-80 at CA-12 interchange at the Cordelia Truck Scales uses Monotube gantry.

[bing101]

Here is AARoads shot of another Monotube Gantry this time near San Francisco International Airport on I-380.

[tolbs17]

Rare monotube gantry in NC

https://goo.gl/maps/qhLtb8cx6G9nDZmu6