What does a painted blue curb signify? How about a painted green curb?

Question

I know what a red curb, white curb, and yellow curb means, but blue and green ones confuse me...

Answer 1

In Spain a blue kerb indicates that parking is permitted but payment is required.

Answer 2

Red Curbs: Are fire zones. No vehicle may stop, stand, or park in a red zone, whether the vehicle is attended, or unattended.

Yellow Curbs: Are loading and unloading zones. The are designed for the loading and unloading of passengers or freight for the time specified by local ordinance.

Green Curbs: Indicate time limit parking specified by local ordinance.

Blue Curbs: Indicate parking exclusively for disabled persons. You must have a valid disabled persons placard to use these spaces.

Answer 3

I think blue means handicap curb-side parking. I don't know about green.