Before starting a trip in a heavy vehicle, why is a pre-drive (walk-around) inspection important?

1. It is not necessary if the vehicle was driven yesterday
2. It helps the driver identify defects such as low tyre pressure, air leaks, lighting faults, or load security issues before they cause a breakdown or crash
3. It is only required once a year at a service centre
4. It replaces the need for a valid roadworthy certificate