

The letters "PC" stand for "pneumatic commercial", which denoted that a vehicle was intended for business use and had pneumatic tires instead of solid tires, which tended to damage roads and were taxed at a much higher rate as a result.ġ929 (top) - Passenger vehicle / Embossed steelġ929 (bottom) - Official city vehicle / Embossed steel

A diamond around the "E" denoted a state vehicle, an oval denoted a county vehicle, and a square denoted a city vehicle.

The letter "E", for example, denoted that a vehicle was owned by a government and thus exempt from taxes. Another major change was the incorporation of letter codes to indicate a type of vehicle or driver. An orange and black color scheme was also adopted after a federal study determined that such a combination was the easiest to see both day and night. The year also marked the introduction of a larger, more readable plate size and a new numbering system beginning with the prefix "1A". Beginning in 1929 the Norris Manufacturing Company in Los Angeles began producing California's license plates.
