Autobahns of Austria
Unlike German autobahns, on Austrian autobahns a general speed limit of 130 km/h (81 mph) is set, although as of August 25, 2018, the FPÖ government has been going on a trial for a possible speed limit increase to 140 km/h (87 mph) on the Autobahn 1 freeway. They may only be used by powered vehicles that are designed to achieve at least . While on the motorway voluntary stops, U-turns and backward driving are prohibited.
Speed limits in the United States by jurisdiction
Urban districts by default are posted at . Outside of the municipal limits, two-lane state and federal highways have a speed limit of unless otherwise posted, and 2 lane county roads have a speed limit of unless otherwise posted. In June 2015, the Arkansas Highway Commission authorized the Arkansas Highway and Transportation Department (AHTD) to raise the speed limit on undivided 4 and 5 lane roads from while divided 4 lane roads are set to go from , these changes affect of Arkansas highways. Furthermore, AHTD has established freeway default speed limits. Along rural freeways the limit is while suburban freeways are posted at . School zone speed limits apply only when children are present, or when a lighted beacon is on if one is provided and such speed limits are set at unless otherwise posted. It is fairly common however that schools serving only higher grade levels will not have a school speed limit in rural areas or where such school sits more than off of the highway or street.