A fiery crash in Woodacre took the lives of four teenaged girls and severely injured two others last Friday evening, a cataclysm that has plunged the close-knit communities of San Anselmo, Fairfax and the San Geronimo Valley into grief and prompted calls for safety measures on the winding route through the redwoods.
Olive Koren, age 14, Sienna Katz and Ada Kepley, both 15, and Josalynn Osborn, 16, died in the single-car collision, which occurred shortly…