Core: One-way streets, narrow single carriageways, separated carriageways and service roads

You may only enter a one-way street from one side; reversing and U-turns are forbidden, backing into a parking bay is not (Book p.61-62). Outside the built-up area, a narrow single carriageway demands extra attention for the edge: watch out for a sharp edge and/or a lower-lying verge. If your right-hand wheels leave the road surface, you quickly lose control of your steering (Book p.64). On a road with separated carriageways — for example by a central reservation — a sign usually shows which carriageway to follow. If there is no sign, the fallback rule applies: keep right, so follow the right-hand carriageway (Book p.66). A ventweg (also called a parallelweg) runs alongside the main carriageway, marked by sign C5. The main road is for fast, through traffic; the ventweg is for slow, local traffic (Book p.66-67).