It's interesting to condense the responses into one post.
Mostly cut and paste from this thread.
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Put a girder across the street
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run a steel cable and use that to support 30+ ft. of seal tight
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bore under the street and run underground
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supports on the structures on each side and span the road with a pair or bar joists with stiffeners between the joists to prevent twisting
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lash PVC conduit to a support cable
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running a steel cable and supporting a cable of some sort off it. maybe MC
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ACSR quad the change over to a "conventional" wiring method at each end.
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Deep v bar across the coupling (top of pipe).... two cowboys (conduit hangers) on each length before and after the coupling. Eye hook on v bar..........guy line from eye hook to building. building on left down to left coupling splint...building on right down to right coupling splint
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CLX for the entire run with messenger support of the span
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cable tray.
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installing a beam for conduit support
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Stainless steel hose clamps would hold it nicely to that pipe. No pentrations, easy install, easy servicing if ever necessary
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Why not bore under the roadway and avoid all of the pitfalls of routing overhead including wind/weather and traffic/vehicle damage?
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You can just use all thread and uni-strut and straps and make the mounting look like every thing else in an industrial plant.
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Steel cable above the pipe, attached to buildings on either side. Drop support wires from the cable to the pipe; adjust turnbuckles until level.
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How about simple, messenger supported multiconductor cable?
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I'll have to admit, some of you folks are pretty creative!!!