Final answer:
A white-painted curb designates that parking is prohibited, except for buses. The correct answer is option D.
Step-by-step explanation:
If a curb is painted white, it designates an area where parking is prohibited, unless you're driving a bus. This means that you are not allowed to park your vehicle on the white-painted curb unless you are a bus driver. The purpose of this restriction is to ensure that the designated area remains clear for bus parking and maneuvering.
For example, in many cities, white-painted curbs are found near bus stops or bus loading zones. These areas need to be kept clear for buses to drop off and pick up passengers, and parking in these spaces can disrupt the flow of traffic and inconvenience bus commuters.
In conclusion, if you see a white-painted curb, remember that it signifies that parking is prohibited, unless you're driving a bus. This is to ensure that buses have sufficient space to load and unload passengers.