Exceptions:
- If your own level isn't high enough, you can lock on your max level, and/or you can ask for help.
- If the aerials or Streetview deviates from the real situation, it is OK to lock 1 level higher, as a special notice.
- Complex situations can be secured by a higher level-lock.
- Segments subject of roadworks can be locked 1 level higher, as a special notice.
- Segments with a time-based restriction, should be locked on level 3.