Rear-view cameras are recommended by the government but not required so many car makers haven't installed them.
That wiggle room is costing lives and now car safety advocates are suing the federal government to make a change, CNN's Rene Marsh reports.
It was October 2002 when Dr. Greg Gulbransen got into his car, checked the mirrors, looked over his shoulder, and reversed.
He accidentally ran over his son Cameron.
In 2008, Congress passed a law in the child's name requiring the department of transportation do something to prevent back up accidents.
But it's more than two years past the congressional deadline and there's still no action.
Gulbransen and three safety groups are now suing the government and calling for mandatory rear-view cameras in all vehicles.
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