Careless, Dangerous? Thats all i could think of off the top of my head.
Regulation 455/07 Section 2 (1) 3 iii "repeadedly changing lanes in close proximity to other vehicles so as to advance through the ordinary flow of traffic while driving at a rate of speed that is a marked departure from the lawful rate of speed".
Driver's licence will be suspended for 7 days, vehicle gets towed and impounded for 7 days, minimum $2,000 upon conviction. Must pay towing and impounding fees, licence re instatement fees after the 7 day suspension. When all that is done, the insurance company will really put the screws to the driver...
You indicate that he was going 60 km/h in a 60.
Depending on the circumstances, failing to signal and possibly careless based on the totality of the incident.