Pursuant to RCW 47.36.200, amend MUTCD Section 6F.54 to read:

A supplemental plaque displaying the message motorcycles use extreme caution is added to MUTCD Figure 6F-4. Delete the Motorcycle symbol (W8-15P) plaque from Figure 6F-4.

The motorcycles use extreme caution (W21-1701P) plaque (see Figure 6F-4) may be mounted below a loose gravel (W8-7) sign, a grooved pavement (W8-15) sign, a abrupt lane edge (W21-801), a metal bridge deck (W8-16) sign, or a steel plate ahead (W8-24) sign if the warning is intended to be directed primarily to motorcyclists.