A CA number refers to a unique identifier assigned to a commercial vehicle by the CHP when it is registered with the Motor Carrier Permit (MCP) program.
The MCP program is a regulatory program administered by the CHP that requires certain commercial vehicles operating in California to obtain a permit and comply with various safety regulations. As part of the MCP program, the CHP assigns each registered commercial vehicle a CA number, which is displayed on the vehicle in a specific format.
The CA number is used by the CHP and other law enforcement agencies to identify commercial vehicles and enforce safety regulations. It can also be used by the public to report safety concerns related to commercial vehicles to the CHP.