Prohibitive Signs: Use the color red for regulatory signs as a background color to denote restriction and as a circular outline and diagonal bar a prohibitory symbol.

      R1-1             R1-2            R1-3-2          R1-3-3

    R1-3-4            R1-4              R3-1            R3-1P

      R3-2            R3-2P             R3-4            R3-4P

      R5-1            R5-1A             R5-2            R5-2P 

      R5-6            R5-6P            R8-3A          R8-3AP

     R8-3AP            R9-3             R9-3A