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Maximum Speed for Designated Vehicles
22406. No
person may drive any of the following vehicles on a
highway
at a speed in excess of 55 miles per hour:
(a) A motortruck or truck tractor having three or more axles or any motortruck or truck tractor drawing any other vehicle.
(b) A passenger vehicle or bus drawing any other vehicle.
(c) A schoolbus transporting any school pupil.
(d) A farm labor vehicle when transporting passengers.
(e) A vehicle transporting explosives.
(f) A trailer bus, as defined in Section 636.