Final answer:
The maximum overall length of a single vehicle, whether loaded or unloaded, varies by region and road type, and it is important to check local regulations. For pedestrian safety, crossing distances are based on vehicle dimensions and speed limits, requiring one to cross a distance greater than the width of a car before it reaches them.
Step-by-step explanation:
The length restrictions on vehicles can vary by locality, state, and country. In general, there is no universal measurement for the maximum overall length allowed for a single vehicle, whether loaded or unloaded. It's necessary to consult local traffic regulations as they define vehicle size limitations, and those lengths can differ based on the type of road and region. For safe road-crossing practices, one must consider the speed limit, the dimensions of the vehicles, and their respective stopping distances. To cross safely in a town or city where the speed limit is 60 km/hr and the average car length is 3.5 meters, a distance greater than a car's width which is typically around 2 meters would be necessary. This means a pedestrian would need to be able to walk at least 4 meters before the car reaches them to safely cross the road. These are general precautions to ensure safety and prevent road accidents.