Automobile insurers may use factors unrelated to driving, like education and occupation, in determining rates.

Now, a consumer group is urging state insurance commissioners to restrict insurers’ ability to use those factors, arguing that the result has been unfairly high rates for lower-income drivers. Stephen Brobeck, executive director of the Consumer Federation of America, said in a call this week with reporters that premiums should mainly reflect factors like accidents, speeding tickets and miles driven.

The federation analyzed auto insurance premiums quoted on the Web sites of the five largest insurers (State Farm, Allstate, Geico, Progressive and Farmer’s) to price minimum liability coverage in five cities. Using an example of coverage for a 35-year-old woman with a good driving record, the study obtained quotes while varying characteristics like marital status, education level, occupation, home ownership and gaps in insurance coverage. Her driving record was the same in all instances.

Read More: The New York Times