More than 800 rear-seat passengers who weren’t wearing seat belts were killed last year in U.S. traffic crashes, and a highway safety group says states aren’t making enough progress in getting people to buckle up.

The Governors Highway Safety Association says in a report released Monday that more than 400 of the 803 people who died would have survived if they were belted.

The association put out a report in 2015 drawing attention to rear seat-belt use The group, which represents state highway safety offices, says 20 states still don’t have laws requiring rear belt use.

It is a law in Utah for rear passengers to wear restraints.

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