In Arkansas, a curb painted yellow indicates

To restrict parking, colored curb markings can be used in addition to or instead of regulatory signs. In Arkansas, a curb painted yellow indicates a loading zone. As with a No Parking sign, you may stop there just long enough to pick up or drop off passengers or cargo. A red curb indicates a fire zone. You may not park or stop there. (Note: There is no national standard for curb colors. Each state can choose how to use curb colors, and some states don't use them at all. When traveling out of state, always check the local traffic laws.)