New Mexico State Road 421
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| Route information | ||||
| Maintained by NMDOT | ||||
| Length: | 8.101 mi (13.037 km) | |||
| Existed: | 1988 – present | |||
| Major junctions | ||||
| West end: |
 NM 402 near Sedan
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| East end: |
 SH 102 at the Texas state line |
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| Location | ||||
| Counties: | Union | |||
| Highway system | ||||
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State Road 421, or NM 421, is a state highway in the U.S. state of New Mexico maintained by the New Mexico Department of Transportation (NMDOT). The road, located in southeastern Union County, begins at NM 402 between Amistad and Clayton and passes eastward through the town of Sedan to the Texas state line where the roadway continues as Texas State Highway 102 to U.S. Route 87 near Dalhart, Texas. Before 1988, the road was part of a much longer NM 102.
The 8.1-mile (13.0 km) two-lane road begins at a t-intersection with NM 402 south of Clayton and west of Sedan in rural Union County. The highway passes through farmland as it travels east before it enters the small town of Sedan, serving as the town's main east-west road. After leaving Sedan, the highway traverses more farmland before terminating at the New Mexico–Texas state line just west of Farm to Market Road 296. The highway continues east into Dallam County, Texas as Texas State Highway 102 until it terminates at U.S. Route 87 northwest of Dalhart.
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