The National Highway Traffic Safety Administration said Monday it would not meet its Dec.
31 deadline to set new rear visibility rules that could lead to backup cameras.
It's the fourth delay since Congress approved legislation in 2007 requiring new standards for rear visibility amid concerns about the costs raised by automakers.
The regulation is aimed at helping eliminate blind zones behind vehicles that can hide the presence of pedestrians, especially young children and the elderly.
"The department remains committed to improving rearview visibility for the nation's fleet and will issue a final rule upon completion of the regulatory review process," NHTSA said in a statement.