**In Indiana the maximum speed limits on Interstate Highways are usually posted at 70 mph (113 km/h) for cars and 65 mph (105 km/h) for trucks with a gross vehicular weight (GVW) of 13 tons or greater, except in urban areas, where it is generally 55 mph (89 km/h) in city centers, except stretches of I-70 in Indianapolis where it is 50 mph (80 km/h), and 65 mph (105 km/h) for cars / 60 mph (97 km/h) for trucks in suburban areas.**

Most non-Interstate Highways are posted at 55 mph (89 km/h), but some rural four-lane divided highways (such as rural stretches of U.S. 31, U.S. 40 and U.S. 41, among others) are set at 60 mph (97 km/h). These limits often decrease to 30–50 mph (48-80 km/h) approaching urban areas, and within cities a speed limit of 20–30 mph (32–48 km/h) is not uncommon, though larger arterial roads within cities may reach as high as 45 mph (72 km/h).