Apainted curb is designated for disabled persons who display their placards.

Blue painted curb, is the right answer.

Explanation:

A placard is a notice fixed in a communal place, like a little board, sign, or plate. It may be attached to or fastened from a transport or structure to symbolize information about the carrier driver or contents of a transport or construction. Accordingly, a Blue painted curb is allocated for disabled persons who display their placards.

is this from a story?

if so, can you tell which one?

~courtney