The highest posted speed limit in the country is 85 mph (137 km/h) and can be found only on Texas State Highway 130, a toll road that bypasses the Austin metropolitan area for long-distance traffic.
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General speed limits in RussiaFor motorcycles and cars under 3.5 tonnes, the limits are generally 60km/h in built-up areas and 110km/h on expressways and other roads. Larger vehicles and those with trailers, however, can only drive at up to 90km/h on expressways and 70km/h on other roads.
More than half of the total length of the German autobahn network has no speed limit, about one third has a permanent limit, and the remaining parts have a temporary or conditional limit. Some cars with very powerful engines can reach speeds of well over 300 km/h (190 mph).
TIL he Autobahn accident rate is consistently lower than other super highway systems, including the United States Interstates. The annual fatality rate is 2.7 per billion km compared to 4.5 for the United States. tl;dr: For visiting Americans trying the Autobahn: FOLLOW THE RULES OR GTFO!