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I think I've had this happen a few times. Best as I recall, it's a result of upgrading a bridge between different types. I believe highways and six-lanes default to suspension bridges, while four-lanes get the arched steel structure and the two-lanes the plain bridge. If you upgrade a chunk of a completed bridge, it'll only change the graphics along the road segments you upgrade, so if you only do half the bridge, the end results look a bit funny.
I believe I can fly
I believe I can touch the sky
I think about it every night and day
Spread my wings and fly away
I believe I can soar
I see me running through that open door
I believe I can fly...
Well I managed to repeat it, turns out when using the extended road mod (though it doesn't seem to be limited to that), switching the road directions will flip the sides the supports.
I believe I can fly
I believe I can touch the sky
I think about it every night and day
Spread my wings and fly away
I believe I can soar
I see me running through that open door
I believe I can fly...