Yes, cars are allowed on the Bike Boulevard. The concept is to make all users aware of these bicycle preferred routes.
When driving an automobile: Vehicles are allowed to drive on and over bike boulevard pavement markings. If you find yourself driving behind a bicyclist and need to pass, only overtake the bicyclist at a safe speed and only if there is a legally safe passing distance of at least 3 feet. Motor vehicles are permitted on almost all portions of bike boulevards unless signs or pavement markings indicate otherwise. Turning from or onto a bike boulevard may be restricted at some intersections.
When riding a bike: While a bike boulevard prioritizes bicycle traffic, you must still obey all traffic signs and signals. Bicyclists must yield to pedestrians and motorists who have the right-of-way.