Bike Shield gives out the GPS of a cyclist or motor cyclist to safety minded motorists. A beep or something warns motorists when a cyclist is 20 meters around a blind curve on a "scenic" or "historical" highways.
(Historic = no bike lane, no shoulder, no grading, no guard rails just a sheer cliff with blind curves on narrow lanes.)
Alternatively, if privacy is an issue, motorists could be required to buy old tech RF receivers to detect cyclists' transponders around curves much like safety belts and bike lights are mandatory.
Governor Brown won't scrape out a bike lane on San Pasquel Valley Road so this is the next best solution.
Bret Cahill
"Staying Alive Means No Accident"
-- California "historical highway" road sign