Question: What's the speed limit on the autobahn?

Speed limits in Germany


General speed limits in Germany are set by the federal government. All limits are multiples of 5km/h. There are two default speed limits: 50km/h (31mph) inside built-up areas and  100km/h (62mph) outside built-up areas. While parts of the autobahns and many other freeway-style highways have posted limits up to 130km/h (81mph) based on accident experience, congestion and other factors, many rural sections have no general speed limit. The German Highway Code (Straßenverkehrsordnung) section on speed begins with the requirement [1] which may be rendered in English:
Any person driving a vehicle may only drive so fast that the car is under control. Speeds must be adapted to the road, traffic, visibility and weather conditions as well as the personal skills and characteristics of the vehicle and load.
This requirement applies to all roads, and is similar to the "reasonable speed" legal obligation levied in other nations.
Speed limits are enforced with a small tolerance. Driving merely 3km/h (2mph) or faster above the posted or implied speed limit is considered a punishable infraction in Germany. The speeding fines are set by federal law (Bußgeldkatalog, schedule of fines).[2]
History
The Nazi-era Road Traffic Act of 28 May 1934 imposed the first nationwide speed limit: 60km/h (37mph) maximum in urban areas, but no limit on rural highways or autobahns.[3] In October 1939, the Nazis further throttled speeds in order to conserve fuel: 40km/h (25mph) in urban areas, 80km/h (50mph) elsewhere.[4] After the war, the four Allied occupation zones established their own speed limits until the divided East German and West German republics were constituted in 1949; initially, the Nazi speed limits were restored in both East and West Germany.[5]
In December 1952 the West German legislature voted to abolish all speed limits,[6] reverting to State-level decisions. However, rising traffic fatalities led to a partial reversal: an urban speed limit of 50km/h (31mph) became effective 1 September 1957, despite resistance by the German Auto Club.[7][8][9] By 1970, fatalities had climbed to over 19,000; in 1972 a general rural speed limit of 100km/h (62mph) went into effect—except on motorways. At 14 November 1983 the Hamburg suburb of Buxtehude had the first implementation of 30km/h (19mph) limits in residential areas,[10] a concept that became popular.[11]
East Germany's safety efforts primarily focused on restrictive traffic regulation; for examples, zero alcohol tolerance, 100km/h (62mph) on autobahns and 80km/h (50mph) outside cities. Within two years after German reunification in 1990, the availability of high-powered vehicles and a 54% increase in motorized traffic led to a doubling of annual traffic deaths, despite interim continuation of prior speed restrictions.[12] An extensive program of the four Es (enforcement, education, engineering, and emergency response) brought the number of traffic deaths back to pre-unification levels after ten years while traffic regulations were conformed to western standards (e.g., 130km/h (81mph) Autobahn advisory limit, 100km/h (62mph) on other rural roads, and 0.5 milligrams BAC.[13]
Autobahns

German autobahns are famous for having no universal motorway speed limit, although slightly more than 50% of them have posted speed limits[14] and about 10% are equipped with motorway control systems that can show variable speed limits.[15] There is no national speed limit, either, for cars and motorcycles on any highway outside of towns if it has a central reservation or a minimum of two marked lanes per direction. Due to this it is common to be overtaken by cars or motorcycles travelling over 200km/h (125mph). On such roads, as well as motorways, a recommended speed limit (Richtgeschwindigkeit) of 130km/h (81mph) applies. While driving at higher speeds is not punishable, the increased risk induced by higher speeds (erhöhte Betriebsgefahr) may result in partial liability for damages. Moreover, the law forbids travel at speeds that would extend the vehicle's minimum halting distance beyond the driver's line of sight.[16] On all German roads, there are speed limits for trucks, buses, cars towing trailers, and small motorised vehicles (Mopeds, etc.).
The introduction of a national speed limit for motorways and similar roads has been on the agenda of various political and environmentalist groups for decades, but at present, there are still no definite plans on behalf of the federal government regarding the matter.
History
In 1973, in the wake of the 1973 oil crisis, a federal speed limit of 100km/h (62mph) on Autobahns was imposed to help conserve fuel for fear of impending future shortages (not for environmental or safety reasons). The measure only lasted from December 1973 to March 1974; while the administration and the Bundestag were in favor of keeping the speed limit, the Bundesrat pushed to repeal the law. As a compromise, a recommended speed was introduced on Autobahns and "highways outside of built-up areas with a center divide or without a center divide and a continuous lane for overtaking in both directions". This law is basically still in effect today. Unrestricted non-Autobahn highways, however, have since become virtually non-existent or replaced by Schnellstraßen, Autobahn-like expressways typically limited to 120 or 130km/h and normally only covering a few kilometers.
The Umweltbundesamt (Federal Environmental Agency) repeated its recommendation of such regulation in early 2007, but the Merkel administration saw no need for it. Even after a 2007 party congress held by the SPD, then one of Germany's governing parties, where a proposal to impose a blanket speed limit was approved, there was outspoken opposition within the administration. At present, it is generally thought that a blanket speed limit would not be significantly beneficial, regarding both environmental and climate concerns and road safety. Current estimates conclude that a speed limit would reduce Germany's overall CO2 emission by a mere fraction of a percent, and in terms of highway safety, German Autobahns are among the world's safest.
Legally, however, state and even local authorities have the power to enact speed limits. The district of Köln / (Cologne) has posted a speed limit on the heavily frequented Kölner Autobahnring / (Cologne Beltway). Effective 9 April 2008, the City-State of Bremen began enforcing a general 120km/h (75mph) speed limit, citing environmental concerns.  However, Bremen's new limit only impacted an additional 11kilometers of Bremen's 60kilometers of Autobahn;[17]  most Bremen motorways already had some speed restriction due to congestion and noise.[18]
In 2006, half of German motorways had no maximum speed limit at any time of day or under any traffic conditions.[19] Roughly one third of regulated roads have computer-controlled traffic guiding systems with variable electronic signs along carriageways showing the set speed limit, or, current road conditions and traffic density allowing, indicating that no speed limit is set at the moment.
Minimum speed
Posted minimum speeds usually only apply to specific lanes like the common configuration on 6-lane roads with a minimum speed of 110km/h (68mph) on the left and 90km/h (56mph) on the center lane. Vehicles which cannot sustain speeds of 60km/h (37mph) on the flat are not allowed on the Autobahn, however. Because of this, many European self-propelled cranes and other extra-heavy trucks which would be unsafe at much higher speeds, but similarly unsafe or impractical (and certainly obstructive) to drive for long distances on surface streets between job sites and depots, are engineered with maximum design speeds a little over 60km/h - typically 62km/h (39mph) at governed engine speed in top gear.
Accident statistics
In 2013, autobahns carried 31% of motorized road traffic while accounting for 13% of Germany's traffic deaths. The autobahn fatality rate of 1.9 deaths per billion-travel-kilometers compared favorably with the 4.7 rate on urban streets and 6.6 rate on rural roads.[20]
Between 1970 and 2010, overall German road fatalities decreased by almost 80% from 19,193 to 3,648; over the same time period, autobahn deaths halved from 945 to 430 deaths.[21] Statistics for 2013 show total German traffic deaths declined to the lowest count ever recorded: 3340; a representative of the Federal Statistical Office attributed the general decline to harsh winter weather that delayed the start of the motorcycle-riding season.[22] However, autobahn deaths increased over 2012 counts (from 387 to 428).[20] Nevertheless autobahn deaths with involved trucks are increased. The reason is more truck traffic and traffic jams caused of roadworks. Whereas accidents without involved trucks are decrasing again.[23]

per 1,000,000,000 travel-kilometres
Other roads
Rural roads, except for motorways or other designated fast roads, have a speed limit of 100km/h (62mph), which is routinely reduced to 70km/h (43mph) or 80km/h (50mph) where the road approaches a junction with a significant side-road. Tree-lined scenic routes, such as the German Avenue Road, often have 70km/h (43mph) limits.[24] Lorries, some buses, and cars towing trailers have lower speed limits as well.
In 2015, the German Safety Council recommended that the general limit be set at 80km/h (50mph) for rural roads less than six meters wide.[25] The proposed speed would reduce the differential with trucks 3.5 metric tonne trucks, which generally travel at 60km/h (37mph).  In 2013, rural roads spanned approximately 200,000 kilometers in length, and killed at least 1,934 people.


City limits
There is a general speed limit within built up areas, which are marked by distinctive rectangular yellow signs showing the name of the village, town or city, of 50km/h (31mph) but residential areas usually have a lower posted speed limit of 30km/h (18mph). On arterial roads, the speed limit may be raised to 60 or 70km/h (37 to 43mph); this higher speed limit will be posted in the usual way. Motorways crossing cities count as normal Autobahns and can be used for travel within larger cities in many cases.
Minimum speeds are very rarely marked in Germany.
Truck speed limits
There is a general speed limit of 80km/h (50mph) for trucks with a GVWR over 3,500kg (7,716lbs) and for vehicles with trailers. For vehicles with a GVWR of over 7,500kg (16,534lbs) the limit is set to 60km/h (37mph) except on autobahns (also 80km/h).[26] For coaches and cars with trailers the limit is increased to 100km/h on autobahns (under certain requirements).[27] Posted speed signs for trucks are not common, they can be seen on some dangerous curves or descents.
Trucks over 3,500kg are required to have a built-in speed limiter for a maximum speed of 90km/h (56mph), and buses for a maximum speed of 100km/h (62mph).[28] There are a few exceptions for army, police, fire brigade or scientific purposes.