Well, the answer should be neither. All should leave.
If one has traveled to FL, we observe bridges over canals; the approach roads are built up and then down, just to allow clearance for certain boats.
The roads are often only a little above the water level. Forget the rise an fall of tides!
How about Tappan Zee Bridge over Hudson River, or Annapolis Bay Bridge, which rises to allow ocean going vessels under and then returns to ground level.
There's a few covered bridges here in NH which are designed with approaches and bridge higher then surrounding lands.
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