Parameter[28] 2006 2008 Change Autobahn total length 24,735 km 25,240 km +505 km No tempo limit (advisory limit only) 69.2% 65.5% -580 km Variable limit (with advisory maximum) 4.2% 4.1% -5 km Permanent or temporary speed limit 26.7% 30.4% +1,090 km