There is plenty of salt here. Most of the bridges go over salt water.
Freeze thaw can be an issue but not if the road is properly
engineered.
Usually frost heaves are when they did a quicky patch last time.
Water gets under the patch and blows it out when it freezes.
It is still undeniable that the places with the biggest road and
bridge problems have diverted road building money to other things like
trains people won't ride or simply to patch other holes in their
budget instead of patching holes in the bridge.
I doubt very much that the bridges in Florida are subjected to the
amount of salt corrosion that the bridges up here are subjected to.
Down there you get plenty of rain that rinses any salt spray that wind
might deposit on them. Up here the salting starts with the first
freezing sleet or snow and continues all winter. It's only swept up
in the spring.
My neighbor has a very large front yard. It used to be a big hay field
but over the years he's been mowing it, weeding it and developing a nice
looking lawn. Each spring however there are huge boulders "growing" in
the lawn that weren't there the previous fall. Some are
huge... weighing over 1200lbs. I know that because I help him dig them
out with the back hoe on my tractor and then try to pick them up with
the bucket. It's rated to lift 1200 lbs. Some I couldn't pick up and
had to push them off into the woods.
They aren't "growing". When the ground freezes each winter they are
slowly pushed upward until they break the surface and continue to "grow"
each winter until we dig them out.
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