Bypass (road)
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A bypass is a road or highway that avoids or "bypasses" a built-up area, town, or village, to let through traffic flow without interference from local traffic, to reduce congestion in the built-up area, and to improve road safety. A bypass specifically designated for trucks may be called a truck route.
In the picture, the bypass section called Paasikiven–Kekkosentie of the Highway 12 bypasses the city center of Tampere in Pirkanmaa, Finland. Highway 12 was moved between Santalahti and Naistenlahti to the Tampere Tunnel in 2016.
The Newbury bypass near Donnington
Old by-pass sign on Maui for State Route 30 thru surface streets
Overhead sign along Interstate 95 displaying Interstate 295 as a bypass route for Richmond, Virginia
The United States Numbered Highway System is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these highways were coordinated among the states, they are sometimes called Federal Highways, but the roadways were built and have always been maintained by state or local governments since their initial designation in 1926.
The "final" U.S. Highway plan as approved November 11, 1926
This sign, photographed in 1941 on US 99 between Seattle, Washington, and Portland, Oregon, illustrates one rationale for a federal highway system: national defense.