Caltrans scheduled signal work and one-way traffic at Vallecito Bypass Road

Caltrans announced one-way traffic control for signal work at Vallecito Bypass Road on State Route 4, a project scheduled to affect motorists during weekday travel hours from March 23 through March 27, 2026.

The California Department of Transportation issued the traffic advisory on March 20. The notice identified the work location as Vallecito Bypass Road in Calaveras County and warned drivers to expect delays of 5 to 10 minutes while crews carried out the signal work.

Work hours and traffic controls

One-way traffic control was scheduled from 7 a.m. to 4 p.m. Monday through Thursday, March 23 through March 26. On Friday, March 27, the planned work hours were 7 a.m. to 3 p.m.

That schedule meant drivers using the Vallecito bypass and the nearby State Route 4 corridor could encounter alternating traffic during the morning, afternoon and midday construction periods. Caltrans advised motorists to use alternate routes when possible.

The agency also directed travelers to QuickMap for real-time highway conditions. Checking conditions before leaving could help drivers account for the announced traffic controls and expected delays.

Schedule was subject to change

Caltrans said the schedule could change because of traffic incidents, weather, equipment or materials, and other construction-related issues. The advisory provided planned dates and hours rather than a guarantee that work would proceed without adjustments.

Vallecito is a census-designated place in Calaveras County, and the advisory specifically connected the work to State Route 4 at Vallecito Bypass Road. The traffic controls therefore applied to a precise local location rather than to road activity across the county generally.

The notice described a scheduled March project. The available record does not include a newer Vallecito-specific announcement or a confirmed completion update for the work, so it does not establish that the March traffic controls remained active later in 2026. It also does not report crashes, economic losses or permanent traffic changes resulting from the project.

For drivers planning trips through the Vallecito bypass during the announced work period, the key information was the weekday schedule, the expected 5-to-10-minute delays, the possible use of alternate routes and the recommendation to check QuickMap for changing highway conditions.