Art. 15(2) lets cars in some marked multi-lane town streets pick a convenient lane. Why should an AM moped still default to the right?

1. Because mopeds are banned from all multi-lane streets
2. Because a 45 km/h moped is a slow vehicle that Art. 18 keeps in the rightmost lane except when turning or bypassing
3. Because left lanes are reserved for trams only
4. Because AM riders may never change lane