California Code, Vehicle Code - VEH § 35787

The Department of Transportation or local authority, as the case may be, shall issue a truck booster power unit permit only if in its opinion the proposed operation would not tend to endanger the traveling public or to damage the highway, bridge or any highway structure.

The Department of Transportation and local authorities, in issuing a permit, may make such conditions and requirements as in their opinion are necessary or desirable for the safety of the traveling public and of the highway, including bridges and other highway structures.