You are committing an offence under the Air Navigation Act - If you're in control of an aircraft - you can have your licence suspended until an (often lengthy) investigation is completed. If you're driving a vehicle on the tarmac, you can be arrested by the airport police and questioned on your behaviour - possibly leading to prosecution under the previously mentioned Act.
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Emergency vehicles, such as fire trucks and ambulances, may be authorized to cross a runway without contacting the control tower in case of an emergency. These vehicles are trained to respond quickly to urgent situations and may have direct access to the runway to provide immediate assistance.
Hold short runway **
Depending on the airport and the regulations in place, any vehicle can cross the runway provided it is in radio communication with the tower and has had clearance to cross. The would also need to advise the tower when they had cleared or "vacated" the runway. In an emergency, the main vehicles given permission to cross or even enter the runway would be the "crash" trucks and the ATC supervisor. They would still need permission to enter the runway.
At an airport with a control tower already have taxi clearance to cross all runways or get clearance from ATC to cross the runway. :)
Stop, contact the tower to ask permission to cross the runway
You must request permission to cross Runway 22 again with confirmation by light gun.