(Reuters) - California is turning into a battleground for technology that allows auto insurers to track their customers' driving behavior and offer them lower premiums, b u t that privacy advocates reject as an excessive intrusion with serious consequences.

Insurance companies are increasingly installing small boxes in clients' cars that monitor everything from how much customers drive to their average speeds to where they drive.

Auto insurer Progressive Corp, which leads the market for so-called usage-based insurance, estimates that about 70 percent of the people who sign up for the program drive well enough to get a discount.

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