(Olympia, WA)  --  A bill being considered in the Washington State Legislature would make wearing motorcycle helmets optional for riders age 18 and older.  The measure, sponsored by Kennewick Senator Sharon Brown, would require those riding without helmets to have liability insurance, a certificate of deposit, or a liability bond.  Also being heard by the Senate Transportation Committee is a bill that would establish a pilot program to allow motorcyclists to pass a car in the same lane in traffic jams, moving no more than ten miles per hour faster than the car.