southbound towards downtown Dallas 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 in the heavily congested segment of the highway between, generally, Interstate 35E and US 75. This portion of the highway travels through one of the densest regions of
north Dallas, which, coupled with its primary role as a circulator for commuters, makes the freeway constantly congested at all hours of the day and night. The city of Dallas's freeways, much like the city, are generally relatively new and in good condition.
TxDOT is famous for its highway system in the state and many of what could be considered "flagship freeways" lie within the city. One example is
North Central Expressway or
US 75, which was trenched, immaculately landscaped and heavily ornamented between downtown and Loop 12 in the 1990s. Interstate 30 west of downtown Dallas was recently brought to a level near North Central Expressway and Interstate 635, Interstate 30 east of downtown, and Interstate 35E all share similar futures. Construction, like many cities, is a constant burden for the city's heavily automobile-centered culture. == Mass transportation ==