Put something together for US 99 in Livingston and the last traffic light on CA 99 in the Wheeler Ridge-Sacramento corridor:
"Livingston is a city located in Merced County, California which was on the alignment of what was US Route 99. When the US Route System was created during November 1926, US Route 99 was aligned through Livingston via what is now Court Street. US Route 99 moved to Campbell Boulevard when the Livingston Underpass was opened to traffic during February 1939. US Route 99 would be decommissioned in California by June 1965 and the highway on Campbell Boulevard would become part of California State Route 99. Campbell Boulevard in Livingston was the location of the last traffic light on California State Route 99 between Wheeler Ridge and Sacramento. Campbell Boulevard was bypassed by the current California State Route 99 freeway which opened during December 1996. Pictured above is US Route 99 passing through the Livingston Underpass as featured in the March 1939 California Highways & Public Works."
https://www.gribblenation.org/2022/05/former-us-route-99-in-livingston-and.html?m=1
Livingston is the longtime home of Foster Farms. I remember commercials broadcast in LA about 30 years ago, touting their local poultry (as opposed to import from Southeastern states).
Certainly many of their trucks would cause a bit of traffic at that traffic signal.