All oversize loads entering the City of San Mateo must conform to the requirements set by the California Department of Transportation (Caltrans).

In general, any vehicle over 12 feet in width, 14 feet 6 inches in height, and over 80,000 pounds (within the Super Heavyweight category) should obtain an oversize load permit from the San Mateo Public Works Department.

Additionally, loads exceeding these dimensions or weights are subject to review by the City's Traffic Division to determine the safest passage through the city, particularly on routes such as US-101 and I-280 that are critical for logistics operations in the region.

Escort vehicles are mandatory in cases where the width surpasses 18 feet or the length is over 95 feet. For loads exceeding 12 feet in width or 14 feet 6 inches in height, escorts must be equipped with appropriate signage and flags as per Caltrans guidelines. For particularly complex movements, police escorts may be necessary, which can be arranged with the San Mateo Police Department.

To obtain a permit, companies can visit the City's website at sanmateo.gov or contact the Public Works Department directly. Applications necessitate detailed route plans and load specifications. It is advisable to submit applications well in advance to accommodate the review process.

Oversize loads are generally restricted from traveling through residential neighborhoods during morning and evening peak commute times (7-9 AM and 4-6 PM). Seasonal events or roadworks may impose further limitations, necessitating prior coordination with the City.

The base permit fee is $50, and there are charges based on the route's distance and complexity. Additional costs may be associated with police escorts or special arrangements for oversized or super heavyweight permits.