What is the meaning of red-yellow painted curbstones?

1. A marking to emphasize and indicate sidewalks of different heights,
2. Correct answer: Absolutely no stopping, except for the vehicle types that are permitted by the sign.
3. Parking is permitted with parking tickets.
4. Unrestricted parking for public vehicles is permitted.

WhyA red-and-yellow curb prohibits stopping for everyone except the vehicles the sign allows. It is usually a bus stop.