On a Belgian motorway with three or more lanes in your direction, which lanes may a bus, coach, or vehicle over 3.5 t MAM use?

1. Any lane if the bus is less than 10 minutes late
2. Only the leftmost lane, to keep a wide vehicle away from joins
3. All lanes except the hard shoulder
4. Only the two right-hand lanes, except where F13 or F15 lane-choice signs require another lane