Barrier posts (bollards) on bike paths in California are overused

The California MUTCD reads:

Section 9C.101(CA) Barrier Posts on Class I Bikeways
Support:

Before a decision is made to install barrier posts, consideration
needs to be given to the implementation of other remedial measures, such
as Bike Path Exclusion (R44A(CA)) signs (see Section 9B.07) and/or
redesigning the path entry so that motorists do not confuse it with
vehicle access.

It could be necessary to install barrier posts at entrances to bike
paths to prevent motor vehicles from entering. When locating such
installations, care needs to be taken to assure that barriers are well
marked and visible to bicyclists, day or night (i.e., install reflectors
or reflectorized tape).

Guidance:

An envelope around the barriers should be striped as shown in Figure
9C-2. If sight distance is limited, special advance warning signs or
painted pavement warnings should be provided. Where more than one post
is necessary, 1.5 m (5 ft) spacing should be used to permit passage of
bicycle-towed trailers, adult tricycles, and to assure adequate room for
safe bicycle passage without dismounting. Barrier post installations
should be designed so they are removable to permit entrance by emergency
and service vehicles.

Support:
Generally, barrier configurations that preclude entry by motorcycles
present safety and convenience problems for bicyclists.

Guidance:
Such devices should be used only where extreme problems are encountered.

Note that Figure 9C-2 shows no barriers are shown in the path itself.

Chapter 1000 of the Highway Design Manual is still current (it has not
been superseded by the California MUTCD). It states:

Topic 1003 - Design Criteria

1003.1 Class I Bikeways

(15) Barrier Posts. It may be necessary to install barrier posts at
entrances to bike paths to prevent motor vehicles from entering. For
barrier post placement, visibility marking, and pavement markings, see
the MUTCD and California Supplement, Section 9C.101.
Generally, barrier configurations that preclude entry by motorcycles
present safety and convenience problems for bicyclists. Such devices
should be used only where extreme problems are encountered.

It would appear that based on the guidance in both the California MUTCD
and the HDM, barrier posts (bollards) are overused on bike paths in California.