State Highway 121 (Texas)
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| Route information | ||||
| Maintained by TxDOT | ||||
| Length: | 85.563 mi (137.700 km) | |||
| Existed: | by 1939 – present | |||
| Major junctions | ||||
| Southwest end: |
    I-35W / US 287 / US 377 / Spur 347 in Fort Worth
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 US 82 in Bonham
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| Northeast end: |
 SH 78 in Bonham |
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| Highway system | ||||
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→
I-820 from Richland Hills to North Richland Hills
I-635 in Grapevine
I-35E / US 77 in Lewisville
Dallas North Tollway in Plano
US 75 from McKinney to Melissa
US 69 in Trenton
...
Wikipedia