$60 million, really?

I attended the movie on P-22 the mountain lion at the Civic Arts Plaza on Dec. 18 and was moved by the idea of building a passage over the freeway.
However, $50 million to $60 million seems very unrealistic and I am wondering why a large tunnel under the freeway at a fraction of the cost would not accomplish the same thing?
And how do you know the animals will migrate to that one point at Liberty Canyon to cross? Rick ThorntonWestlake Village ...

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