the speed limit on some interstate highways is roughly 135 km/h
Speed limits in the United States vary depending on jurisdiction, with 75 to 80 mph (120 to 130 km/h) common in the Western United States and 65 to 75 mph (100 to 120 km/h) common in the Eastern United States. States may also set special speed limits for trucks and night travel along with minimum speed limits. The highest speed limit in the country is 85 mph (140 km/h), which is posted on a single stretch of tollway in rural Texas.
Speed limits in the United States by jurisdiction