Arkansas Highway 321
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| Route information | ||||
| Maintained by AHTD | ||||
| Section 1 | ||||
| Length: | 11.20 mi (18.02 km) | |||
| South end: |
  AR 5 / AR 367 in Cabot
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| North end: |
 AR 38
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| Section 2 | ||||
| Length: | 3.79 mi (6.10 km) | |||
| South end: |
 AR 31
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| North end: |
 AR 267
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| Location | ||||
| Counties: | Lonoke, White | |||
| Highway system | ||||
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| Location: | Lonoke County |
| Length: | 3.15 mi (5.07 km) |
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| Location: | White County |
| Length: | 0.35 mi (0.56 km) |
Highway 321 (AR 321, Ark. 321, Hwy. 321) is a designation for two north–south state highways in central Arkansas. One route of 11.20 miles (18.02 km) runs from Highway 5/Highway 367 in Cabot north to Highway 38 east of Austin. A second route of 3.79 miles (6.10 km) begins at AR 31 north of Beebe and runs north to Highway 267.
Highway 321 begins near an exit from US 67/US 167 at Highway 5 and Highway 367 in Cabot. The route intersects Highway 89 in south Cabot before exiting the city and running due east. Near Oak Grove the route turns due north, with Highway 321 Spur (AR 321S) continuing east to Highway 31. A 2010 study of annual average daily traffic (AADT) by the Arkansas State Highway and Transportation Department (AHTD) reveals that about 19,000 vehicles per day (VPD) use the route between its southern terminus and Highway 89/Highway 367, with the traffic count dropping to 7,000 VPD between that junction and the Cabot city limits. Traffic counts continue around 2,500 VPD until the Highway 321S junction, then drop to 2,100 VPD for the remainder of the route.
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