Wikipedia:WikiProject U.S. Roads/New Jersey/Selected article/August 2016

U.S. Route 1 Business (US 1 Bus.) is a four-lane surface road that provides an alternate route to the Trenton Freeway (US 1) northeast of Trenton in Mercer County, New Jersey. The route is 2.73 mi long and runs between US 1 in Trenton and Lawrence Township. On the border of Trenton and Lawrence Township, US 1 Bus. intersects the northbound direction of US 206 at the Brunswick Circle. The route was once part of a longer U.S. Route 1 Alternate (US 1 Alt.), which continued southwest through downtown Trenton and into Morrisville, Pennsylvania.

The old US 1 Alt. in Trenton is now signed by the New Jersey Department of Transportation as part of US 1 Bus., despite not being officially recognized as such. Signage in Pennsylvania no longer exists; most of the former US 1 Alternate is now part of Pennsylvania Route 32 (PA 32). US 1 Alt. was created in 1953 after US 1 was moved to a freeway between Morrisville and the Brunswick Circle. By the 1980s, when the Trenton Freeway was extended to its current terminus, US 1 Bus. was created onto its current alignment and US 1 Alt. was removed through Trenton and Morrisville.