What should a commercial driver do when their truck becomes disabled on a high-speed highway at night?

1. Turn on 4-way hazard flashers, put on a high-visibility reflective safety vest, exit cab safely, and place reflective warning triangles at 50m and 100-150m behind the vehicle
2. Sit in the cab with the lights off and wait until daylight
3. Stand in the carriageway behind the truck to wave traffic past by hand
4. Leave the vehicle unmarked and walk ahead to find help immediately