Interstate 10 in Arizona
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| Pearl Harbor Memorial Highway | ||||
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| Route information | ||||
| Maintained by Arizona DOT | ||||
| Length: | 391.99 mi (630.85 km) | |||
| Existed: | 1990 – present | |||
| Major junctions | ||||
| West end: |
  I-10 / US 95 at California state line |
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| East end: |
 I-10 at New Mexico state line |
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| Highway system | ||||
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In the U.S. state of Arizona, Interstate 10 (I‑10), the major east–west Interstate Highway in the United States Sun Belt, runs east from California, enters Arizona near the town of Ehrenberg and continues through Phoenix and Tucson and exits at the border with New Mexico near San Simon. The highway also runs through the cities of Casa Grande, Eloy, and Marana. Segments of the highway are referred to as either the Papago Freeway, Inner Loop, or Maricopa Freeway within the Phoenix area, and the Pearl Harbor Memorial Highway outside metro Phoenix.
The western terminus is located at the California border at the Colorado River in La Paz County where I-10 continues westward into California towards Los Angeles. Here, the same physical road is signed as both I‑10 and U.S. Route 95 (US 95).
The highway runs east by northeast past Ehrenberg and Quartzsite and then turns to an east by southeast orientation just before the junction for US 60. It continues this path entering Maricopa County and the Phoenix Metro area. The route turns east by northeast again at the junction for State Route 85 (SR 85) northwest of downtown Buckeye, and turns due east at Verrado Way (exit 120). Here, the speed limit drops from 75 miles per hour (121 km/h) to 65 (105 km/h). The landscape by this point is largely urban.
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