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Re:Forested Overpasses Allow Animals to Cross Safely Over Hi... by jlg23 on Friday September 25, 2015 @01:51PM (#10279588)
I think this is more a question of planting trees with roots that don't go too deep.

But, even if not - rebuilding them every 15 years might be cheaper than sound engineering for this problem space. After all, they don't have to handle 40 ton trucks or 50 cars at a time.

Re:Forested Overpasses Allow Animals to Cross Safely Over Hi... by Abraln on Friday September 25, 2015 @02:05PM (#10279665)
Agreed, but if you REALLY wanted to be sure, you could always put a large sheet of aluminum just above the bottom layer.
Re:Forested Overpasses Allow Animals to Cross Safely Over Hi... by protomyth on Friday September 25, 2015 @04:11PM (#10280421)
I thought there were problems with aluminum and plants.