Choke points would abound in an emergency evacuation of West Marin. In Inverness, the problem is Sir Francis Drake Boulevard. In Bolinas, it’s Mesa and Olema-Bolinas Roads. And for the entire coast, any of the over-the-hill routes—through the San Geronimo Valley, past Nicasio or around Mount Tamalpais—would become congested if thousands of people . . .

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