Texas State Highway 45
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| Route information | ||||
| Length: | 25.024 mi (40.272 km) | |||
| Existed: | 1985 – present | |||
| Major junctions | ||||
| Beltway around Austin | ||||
| Southwestern segment | ||||
| West end: |
 RM 1826 in Austin
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| East end: |
 Loop 1 in Austin |
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| Eastern segment | ||||
| West end: |
 RM 620 in Austin |
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| Major junctions: |
 US 183 Loop 1 Toll I-35 SH 130 Toll US 290 SH 71US 183SH 130 Toll
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| East end: |
I-35 in Austin |
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| Highway system | ||||
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State Highway 45 is a highway loop around Austin, Texas, that exists in two open segments. The official designation of SH 45 is such to form a complete loop around Austin, a distance of roughly 80 miles (130 km).
One segment is in southwest Austin and runs roughly southeast from Ranch to Market Road 1826 to the southern terminus of Loop 1 (Mopac Expressway). The roadway is a divided, four-lane facility with a wide median intended to accommodate a future freeway, after which the current lanes would serve as frontage roads.
The other segment is a toll road that forms a backwards C-shape along the boundary of Travis and Williamson County before bending down along the eastern edge of the Austin metropolitan area where it shares its route with SH-130.
Before the 2002 Central Texas Turnpike Project (CTTP), SH 45 existed only as a short section of four-lane, divided highway in southwest Austin. The CTTP added a toll road that runs east from US 183 near Cedar Park, crosses I-35, bi-secting the La Frontera development, and meets SH 130 near Pflugerville. South of this interchange, SH 45 is co-signed with SH 130 to US 183 just south of Austin-Bergstrom International Airport. SH 45 then loops westward rejoining I-35 north of Buda.
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