Massachusetts Auto Insurers Hiking Rates

More than a million Massachusetts drivers will see their auto insurance bills increase by as much as 9 percent this year.

Insurance companies and industry officials told The Boston Globe that cheaper gas and an improving economy, which has put more drivers on the road and increased the number of accidents, are to blame.

In addition, as cars have become more sophisticated the cost of repairing them has climbed. Health care costs for those injured in crashes are also on the rise.

USAA has been raising rates on its more than 80,000 Massachusetts drivers by an average of 8 percent since May.

Safety Insurance is scheduled to start charging its 420,000 Massachusetts drivers nearly 6 percent more.

Mapfre USA Corp., with more than a million drivers, is raising rates 3 percent.