Trucking companies in California are subject to various regulations aimed at ensuring the safety of drivers and the public. Here are some of the regulations in place for trucking companies in California:

Licensing and Insurance: Trucking companies in California must have a valid license from the California Public Utilities Commission (CPUC) and must maintain the required insurance coverage.

Drug and Alcohol Testing: Trucking companies in California are required to implement a drug and alcohol testing program for their drivers in compliance with federal regulations.

Vehicle Inspections: Trucking companies must regularly inspect and maintain their vehicles to ensure that they are in safe operating condition. This includes daily pre-trip inspections and periodic inspections by qualified mechanics.

Hours of Service: Trucking companies must ensure that their drivers comply with the federal Hours of Service (HOS) regulations, which limit the number of hours a driver can operate a commercial vehicle in a given day or week.

Driver Qualifications: Trucking companies must ensure that their drivers meet certain qualifications, including possessing a valid commercial driver's license (CDL), passing a medical exam, and undergoing a background check.

Electronic Logging Devices (ELDs): Trucking companies in California must comply with the federal ELD mandate, which requires drivers to use electronic logging devices to record their HOS and prevent falsification of driving records.

These regulations are designed to promote safety and reduce the risk of accidents on California's roads, as well as to protect the rights of drivers and ensure fair competition among trucking companies. In addition to the above regulations, trucking companies in California may also be subject to additional state and federal regulations related to environmental protection, hazardous materials transport, and other specialized areas. It is important for trucking companies to stay up-to-date with all applicable regulations and ensure compliance in order to operate legally and safely in California.