Daily Traffic on the San Mateo–Hayward Bridge

According to the Metropolitan Transportation Commission (MTC) and Caltrans traffic census data, the San Mateo–Hayward Bridge (SR-92) carries an average of 110,000 vehicles per day (AADT - Annual Average Daily Traffic).

Breakdown

• Peak weekday: 120,000–130,000.
• Weekend: 80,000–90,000.
• Directional split: ~55% westbound (AM), ~55% eastbound (PM).
• Truck %: ~8–10% (heavy freight corridor).

Context

• Length: 11.3 km (7 mi) – longest bridge in California, 25th worldwide.
• Opened: 1967 (replaced 1929 lift bridge).
• Toll: Westbound only (FasTrak $7, invoice $8, carpool $3.50).
• Corridor: Links Peninsula (San Mateo, Foster City) to East Bay (Hayward, I-880, I-580). Critical for Silicon Valley ↔ East Bay commute.

Data Sources

• Caltrans Traffic Census Program (annual AADT reports).
• MTC Vital Signs dashboard.
• Bay Area Toll Authority (BATA) toll-tag data (real-time).