mph US-54 from the south end of the Mexico bypass to the Route W interchange just across the Missouri River from Jefferson City, with the exception of the I-70 interchange area at Kingdom City, which is 45 mph. US-54 also has a 70 mph speed limit from Fall Hill Road in Cole County to just north of the Business Route 54 intersection in Lake Ozark. US-63 from the south end of the Kirksville bypass to US-54 north of Jefferson City, with the exception of the section through Columbia from Route B to Route AC, which is 65 mph. MO-7 from I-49 to just west of Clinton. The James River Freeway from I-44 to Route 13 west of Springfield is 70 mph. The speed limit drops to 60 mph through Springfield itself, as do other Missouri freeways. The US-71 expressway from Pineville to Harrisonville had a 70 mph limit before it was upgraded to I-49. Most Missouri lettered highways are 55 mph, and in densely populated areas they can be less. There are several that have a speed limit of 60 mph, including the following: Route M in Jefferson County is an expressway for most of its length, and most of the highway has a speed limit of 60 mph. Route A in Jefferson County, an upgraded two lane road with shoulders, has a 60 mph speed limit. Route A travels between Hillsboro and Festus. Route B in Boone County is mostly an upgraded two lane road with shoulders. As such, it has a 60 mph speed limit from just north of Columbia to the end of the upgraded section 1 mile south of Hallsville. Route C in Cole County is an upgraded two-lane highway with shoulders, and has a 60 mph speed limit from just west of Jefferson City to just east of Russellville. Route A in Osage County follows the former routing of US Route 50 from its intersection with modern-day US 50 to Loose Creek. Since the roadway is designed to the same standards as a major highway, the speed limit is 60 mph on that stretch of road. In the urban areas of: St. Louis, Kansas City, Columbia, St. Joseph, and Springfield, the speed limit typically drops to 60 mph on Interstates and freeways. In addition, on I-44 in Rolla the speed limit is reduced to 60 mph from just west of Exit 184 to Exit 186