Plano was the first city in Collin County to adopt a master plan for its road system. The use of multi-lane, divided highways for all major roads allows for higher speed limits, generally , but sometimes up to on the northern section of Preston Road. Plano is served directly by several major roadways and freeways. Central Plano is bordered to the east by U.S. Highway 75, the west by Dallas North Tollway, the south by President George Bush Turnpike (Texas State Highway 190 (east of Coit Road)), and the north by Sam Rayburn Tollway (Texas State Highway 121). Preston Road (Texas State Highway 289) is a major thoroughfare that runs through the city. Plano is the largest city in Texas without an Interstate Highway.