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.
Speed limits in the United States by jurisdiction
Speed limits on 4-lane divided highways are normally 65 mph although some stretches within cities are posted as low as 50 mph. Open country highways have a statutory limit of 55 mph, which includes most rural two-lane highways and even includes some one lane back country roads or any road without a posted speed limit. Cities and towns set their own speed limits, which are usually between 25 and 55 mph. School zones have a statutory speed limit of 20 mph. Speed limits are commonly reduced by 15 mph in work zones.