(a) “Park” means, when prohibited, the standing of a vehicle, whether occupied or not, otherwise than temporarily for the purpose of and while actually engaged in loading or unloading.
(b) “Stop” means, when required, a complete cessation from movement.
(c) “Stop, stopping or standing” means, when prohibited, any stopping or standing of a vehicle whether occupied or not, except when necessary to avoid conflict with other traffic or in compliance with the directions of a police officer or traffic control sign or signal.