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State Highway 121 is a state highway angling from southwest to northeast through north central Texas. It runs from downtown Fort Worth, Texas at the junction of Interstate 35W to Bonham, Texas, just north of a junction with U.S. Highway 82. Between Fort Worth and Euless, SH 121 is known as Airport Freeway (east of Euless, this name applies to SH 183). From Grapevine and Coppell, it is known as International Parkway. East of Coppell, the highway acts as the frontage road of the Sam Rayburn Tollway, a tolled freeway that runs northeast to McKinney. From McKinney to Melissa, the state highway is concurrent with US 75 and the North Central Expressway. Northeast of Melissa, SH 121 is a smaller roadway referred to in some places as the Sam Rayburn Highway. == Route description == Sections between downtown Fort Worth and Grapevine are freeway, including a small segment near Hurst that coincides with Interstate 820. At Bedford, Texas it has an interchange with SH 183, the Irving freeway that leads toward Dallas; it has an interchange with SH 360, which leads toward Arlington, just to the west of the north entrance to the Dallas/Fort Worth International Airport, to which State Highway 121 gives access. At Grapevine it has interchanges with SH 114 and Interstate 635 before becoming a limited-access tollway that passes between Lewisville and Frisco. It is very heavily traveled south and west of McKinney and has become an urban highway due to the rapid growth of the Dallas–Fort Worth metroplex. Service roads extending southwest to northeast along the corridor from Lewisville to McKinney are free of charge; however the main lanes within the right-of-way are tolled as part of the Sam Rayburn Tollway operated by the North Texas Tollway Authority (NTTA). The highway's northeastern half is primarily two lanes wide and carries significantly less traffic. It meets Interstate 35E at Lewisville, SH 289 near Frisco, US 75 and US 380 in McKinney, US 69 at Trenton, and SH 78 just north of Bonham. Construction began in 2009 on the extension of 121 south from Fort Worth to Cleburne, as a toll road called Southwest Parkway in Tarrant County and Chisholm Trail Parkway in Johnson County. This section will be operated by the NTTA and the entire project, from IH 30 to U.S. 67 is expected to open to traffic in the fourth quarter of 2013.〔http://www.ntta.org/NR/rdonlyres/3FFA8F0C-1525-445F-A169-8B47A341B396/0/NTTA_SWPCT_Brief.pdf", Southwest Parkway/Chisholm Trail Project Status Report March 2009 from the NTTA.〕 In March, 2009, work was completed on a short stretch of 121 northeast of DFW Airport which upgraded two signalized at-grade intersections to a freeway, with overpasses at both intersections, clearing up a problem for rush-hour traffic.〔http://www.wfaa.com/video/?z=y&nvid=344241 "Overpasses give non-stop route between Frisco and D/FW", WFAA-TV report, March 20, 2009.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Texas State Highway 121」の詳細全文を読む スポンサード リンク
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