United States Route 5
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| Route information | |
| Length: | 300.34 mi (483.35 km) |
| Existed: | 1926 – present |
| Major junctions | |
| South end: |
 I-91 in New Haven, CT
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| North end: |
 Route 143 in Stanstead, QC
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| Location | |
| States: | Connecticut, Massachusetts, Vermont |
| Highway system | |
U.S. Route 5 (US 5) is a north–south United States highway running through the New England states of Connecticut, Massachusetts, and Vermont. Significant cities along the route include New Haven, Connecticut; Hartford, Connecticut; and Springfield, Massachusetts. From Hartford northward to St. Johnsbury, Vermont, the road closely follows the route of the Connecticut River.
The entire route of US 5 is closely paralleled by Interstate 91. US 5 now serves as the local business route and alternate route for the Interstate highway. The northern terminus of US 5 is in Derby Line, Vermont at the Canada–US border, where it continues past the Derby Line-Stanstead Border Crossing into Quebec as Quebec Route 143, which was Route 5 until renumbered in the mid-1970s. Its southern terminus is in New Haven, Connecticut at an intersection with Interstate 91.
US 5 runs through three states, Connecticut, Massachusetts, and Vermont, with the latter containing over half of US 5's total distance. Throughout nearly all of U.S. 5's entire length, it remains its own road entirely separate from Interstate 91, which has largely replaced it as a through route (and now carries most of the traffic). It is only co-signed onto I-91 for less than half of a mile in Springfield, MA, before splitting off alone again.
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Wikipedia