(a) No person shall stop or operate a vehicle at such an unreasonably slow speed as to impede or block the normal and reasonable movement of traffic, except when stopping or reduced speed is necessary for safe operation or to comply with law.
(b) In a case involving a violation of this section, the trier of fact, in determining whether the vehicle was being operated at an unreasonably slow speed, shall consider the capabilities of the vehicle and its operator.
(c) Except as provided in Section 408.01(b) and (c), whoever violates this section is guilty of a minor misdemeanor.