Parents are right to dread the day when their teenager gets behind the wheel.
The average married couple will pay 80 percent more for car insurance when their teen is added to the policy, according to a new report by insuranceQuotes.com. Teenage boys and 16-year-olds, girls and boys, are the most expensive additions, nearly doubling their parents' rates.
But location can also make a huge difference in how much a teenager's insurance costs. Six states don't allow insurance companies to use gender to determine rates, and one state—Hawaii—prohibits including age or length of driving experience in the calculation.