21211.  (a) No person shall stop, stand, sit, or loiter upon any
class I bikeway, as defined in subdivision (a) of Section 890.4 of
the Streets and Highways Code, or any other public or private bicycle
path or trail, if the stopping, standing, sitting, or loitering
impedes or blocks the normal and reasonable movement of any
bicyclist.
   (b) No person shall place or park any bicycle, vehicle, or any
other object upon any bikeway or bicycle path or trail, as specified
in subdivision (a), which impedes or blocks the normal and reasonable
movement of any bicyclist unless the placement or parking is
necessary for safe operation or is otherwise in compliance with the
law.
   (c) This section does not apply to drivers or owners of utility or
public utility vehicles, as provided in Section 22512.
   (d) This section does not apply to owners or drivers of vehicles
who make brief stops while engaged in the delivery of newspapers to
customers along the person's route.