A lesser-known fact of car insurance policies is that of the effect of the actual number of policies that have been taken out with the same company. If yourself or your family on multiple vehicles is wise to register them for insurance with the same company. This will generally open up discounts and allow them to be applied to your insurance rates. This will also serve to reduce the overall number of bills they have to pay each month. As well, the number of drivers registered to the same company can have a similar beneficial fact on your overall car insurance rates.