Complex sentence: There are also very short autobahns of just local importance (e.g. ring roads or the A 555 from Cologne to Bonn) that usually have three digits, the first one of which is similar to the system above, depending on the region.
Split into simpler sentences: There are also very short autobahns built just for local traffic (e.g. ring roads or the A 555 from Cologne to Bonn) that usually have three digits for numbering. The first one of which is similar to the system above, depending on the region.