Temporary One-Way Traffic Control on State Route 84 (Niles Canyon) in Sunol

Alameda County - Caltrans will implement temporary one-way traffic control on State Route 84 (Niles Canyon) in the City of Sunol near post mile 15.5 at the Rosewarnes Undercrossing (U/P) and Niles Canyon Railway Brightside Yard. Crews will be installing and connecting a specially designed new guardrails to a newly constructed bridge on eastbound SR-84. The temporary one-way traffic control is necessary to safely complete this work.

Work Schedule:

• Start: Wednesday night, September 24, 2025
• Duration: Approximately four weeks (September 24 - October 24, 2025)
• Traffic Control: One-way traffic control will be in place 24 hours daily for the duration of the project.

Traffic Impacts:

• One-way traffic control will result in longer delays during commute hours
• Detour available:
  
  • Use alternate routes via NB/SB I-680 to SR- 238
  • From SR-238 back to NB/SB I-680

Work is weather dependent and expect travel delays.

Caltrans will update its X page at https://twitter.com/CaltransD4 on the latest highway conditions, and drivers are encouraged to check out Quickmap https://http://quickmap.dot.ca.gov/ Motorists can also receive 24/7 highway condition information statewide by calling 1-800-427-ROAD or 1-800-427-7623.

Thank you for your patience as we work to maintain our state's highways, bridges, and tunnels.

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