Incident
A snowplow driver, having completed plowing on an airport service road, proceeded to another area of the airport that required plowing. The route necessitated crossing a taxiway and an active runway. The driver stopped short of the taxiway but, without obtaining clearance from air traffic control (ATC) or airport operations, crossed the runway. While crossing, the driver observed a landing airplane and increased acceleration.
Flight Crew Response
The flight crew of the landing aircraft initially saw the snowplow holding short of the taxiway. After touchdown, during the landing roll, they saw the snowplow cross in front of them. The flight crew applied "significant" reverse thrust and brakes to bring the aircraft to a halt on the runway.
ATC and Safety Systems
The ground controller did not see the snowplow, but became aware of the runway incursion when the flight crew reported it. The Airport Movement Area Safety System (AMASS) was operational at the time, but no alarm sounded.