At 10:33 Pacific time, a Cessna 172L collided with a Cessna 182P while taxiing on taxiway A-4 at Snohomish County Airport. Neither pilot was injured. The pilot of the 172 said he was taxiing forward in a line of aircraft and stopped his aircraft about 10-15 feet behind the Skylane directly ahead. As he waited for his turn, he focused his attention on setting up radio frequencies for his upcoming flight. When he looked up, he noted that his aircraft was rolling forward. He applied brakes and right rudder, which swung the nose of his aircraft to the right, but not before the propeller struck the 182s right horizontal stabilizer and elevator.