Louisiana Highway 3
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| Route information | ||||
| Maintained by Louisiana DOTD | ||||
| Length: | 35.8 mi (57.6 km) | |||
| Existed: | 1955 renumbering – present | |||
| Tourist routes: |
 Louisiana Scenic Byways:Northwest Louisiana Scenic Byway |
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| Major junctions | ||||
| South end: |
   I-20 / US 71 / LA 72 in Bossier City
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  US 79 / US 80 in Bossier City I-220 in Bossier City LA 2 in Plain Dealing
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| North end: |
 AR 29 at Arkansas state line north of Bolinger
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| Location | ||||
| Parishes: | Bossier | |||
| Highway system | ||||
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| Location: | Bossier City |
| Length: | 0.26 mi (0.42 km) |
| Existed: | 1966–2010 |
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Louisiana Highway 3 (LA 3) is a state highway located in Bossier Parish, Louisiana that runs 35.8 miles (57.6 km) in a north–south direction from a junction with Interstate 20 (I-20), U.S. Highway 71 (US 71), and LA 72 in Bossier City to the Arkansas state line north of Plain Dealing.
LA 3 connects Bossier City, the largest city in Bossier Parish, with the town of Benton, the parish seat. Apart from the interchange with I-20 and US 71 at its southern terminus, LA 3 also connects to I-220, the northern bypass of Shreveport and Bossier City. North of Benton, LA 3 passes through Plain Dealing where it intersects LA 2, Louisiana's northernmost cross-state route.
The majority of LA 3, extending from I-220 north to the Arkansas state line, is part of the Northwest Louisiana Scenic Byway, one of the state-designated Louisiana Scenic Byways.
From the south, LA 3 begins at an intersection with LA 72 (Old Minden Road) in Bossier City. Opposite this intersection are ramps leading to a partial interchange with I-20 and US 71 at the point where the two highways begin a concurrency across the Red River westward into Shreveport. Traffic from southbound LA 3 can enter I-20 westbound only (concurrent with northbound US 71), and traffic from eastbound I-20 (concurrent with southbound US 71) can exit to LA 3 north at Exit 20B. All movements are supported between LA 3 and US 71.
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