grid, especially with major thoroughfares. In trying to make the city traversable, city planners have over time created wide boulevards that jump between the rights-of-way of multiple minor streets, trying to force a wide road wherever they can discover space for it. This forces the destruction of the minor streets' original paths, a name-change for the boulevard or minor streets, and roads (e.g. Cole 1, 2, 3) that exist in two or more places. Major thoroughfares in Oak Cliff typically do not cross the Trinity River, and when they do, they frequently do not continue with the same name on the north or eastern sides, which creates a degree of confusion. Also, many times a street will change names each time it crosses a municipal border. Conversely, many streets keep their names through sharp turns across the city. Highways The city of Dallas is at the confluence of a large number of major interstate highways—Interstates 20, 30, 35E, and 45 all run through the city. The city's freeway system, as it has no major geographical inhibitors surrounding it, is set up in the popular hub-and-spoke system, much like a wagon wheel. The center of the system is the downtown freeway loop, made up of Interstate 30 on the south, Interstate 35E on the west, Spur 366 on the north, and Interstate 345 on the east. (Interstate 345 is a short spur of Interstate 45 that connects Interstate 45 with US 75.) The next major freeway loop is the Interstate 635/20 Lyndon B. Johnson loop, and the outermost is the tolled President George Bush Turnpike. Inside these freeway loops are other partially limited-access and parkway-style loops including Loop 12 and Belt Line Road. Another beltway around the city is planned upwards of from downtown in Collin County. Radiating out of downtown as the spokes of the system are Interstates 30, 35E, and 45, US 75, US 175, Spur 366, the tolled Dallas North Tollway, and further out SH 114, US 80 and US 67. Other major highways within the city that do not serve primarily as spokes include SH 183 and Spur 408. Portions of Interstates 30, 35E, and 635, and US 75 also have either bidirectional or reversible HOV lanes. Future highway plans typically integrate usage of both HOV and/or HOT (tolled) lanes, e.g. the expansion of Interstate 635. Plans for the road include HOV lanes and massive HOT tunnels