What is one of the principal rating factors under Proposition 103 allowed for Personal Automobile policies?

While the year of the automobile can influence insurance premiums, it is not considered a principal rating factor under Proposition 103. The age of the vehicle may affect the car's value and the cost of repairs, but it does not directly reflect the driver's risk level, which is the primary focus of this legislation.

The make of the automobile can impact insurance rates due to factors like safety ratings and theft rates. However, similar to the year, it does not serve as a principal rating factor under Proposition 103, which emphasizes driver behavior over vehicle characteristics in premium calculations.

Although insurers may consider a credit record in assessing risk, it is not one of the principal rating factors specified under Proposition 103 for personal automobile policies. This legislation primarily emphasizes driving history rather than financial factors when determining insurance premiums.