>>2051476I thought I recognized what part of Grand Avenue that was and I looked it up and yup that's up near West Covina.
I think the reason Google marks that as a "Bike Path" is because it's meant to help bikes navigate from Grand Ave. to the Schabarum-Skyline Backroad that connects to South Forest Hills Drive.
Google doesn't exclusively mark only bike paths when using bike navigation anon, it'll sometimes mark alternative paths where bikes can ride through that might be more convenient.