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Aim higher, reach further. Get the Wall Street Journal $12 for 12 weeks. Cruising at 85 mph: Texas Opens Fastest Highway in U.S. Texas opened a 41-mile stretch of State Highway 130 today with a new speed limit of 85 miles per hour â the highest legal limit in the U.S.
Under pressure from the U.S., the province lowered the limit to 100 km/h in 1976. And thatâs where it remains today, even though most other jurisdictions have since raised theirs. Most U.S. states have a 70 mph (113 km/h) limit. The highest speed limit in North America is 85 mph (140 km/h) on Texasâs State Highway 130. Ontarioâs low limit is often defended on the basis of speed elasticity â the assumption that drivers will automatically exceed the posted limit by a certain margin.