Bundesstraße
One distinguishing characteristic between German "Bundesstraßen" and "Autobahnen" is that there usually is a general 100 km/h (62 mph) speed limit on federal highways out of built-up areas, as opposed to the merely advisory speed limit ("Richtgeschwindigkeit") of 130 km/h (83 mph) in unmarked sections of the autobahns. However, a number of "Bundesstraßen" have been extended as expressways (dual carriageways) (colloquially called "Yellow Autobahns"). Many of these have speed limits of usually 100–120 km/h, others have only an advisory speed limit like autobahns. Most sections of the federal highways are only single carriageway with one lane for each direction and no hard shoulder pull-out area.
Bundesautobahn 61
The section between the junctions "Wanlo" and "Jackerath" was upgraded to three lanes in 2005. The speed limit there is 130 km/h, paid for by RWE Power that in return received permission to close a section of A 44 for their Garzweiler surface mining operation. By 2017, the A 44 will be restored and the Wanlo-Jackerath-section of the A 61 will be closed instead.