What do the red-and-white chequerboard markings painted on the carriageway at the start of a lane tell a heavy vehicle driver?

1. The lane is an escape lane reserved for vehicles that have lost their brakes, and stopping or parking on it is prohibited
2. The lane is a weighbridge approach lane that all vehicles over 3.5 tonnes must enter
3. The lane is a bus lane and heavy goods vehicles may not use it
4. The lane is closed for roadworks and no vehicle may enter it