Final answer:
Passing vehicles must slow down and 'Move Over' when approaching an emergency vehicle stopped on the side of the road to ensure safety for public service personnel.
Step-by-step explanation:
When an emergency, stationary public safety and/or road service vehicle is stopped alongside the roadway, passing vehicles should follow the local law, which typically includes slowing down and moving over to give the stopped vehicle space if the road has multiple lanes.
This is known as a 'Move Over' law in many jurisdictions. It is important for drivers to be aware of these safety regulations and to comply with them to ensure the safety of the public service personnel working on the road.