What is the primary danger when approaching an overloaded timber truck or heavy freight vehicle on a rural road?

1. Risk of falling logs or shifting cargo, tyre blowouts, and much longer stopping distances than a car
2. The truck's air brakes make it stop far more quickly than your car, so you risk running into it
3. The truck is legally obliged to pull over for you, so you can overtake without checking ahead
4. The load overhanging the rear is always lit and flagged, so it can safely be ignored at night