WASHINGTON (Reuters) - The National Highway Traffic Safety Administration said on Monday it will not reconsider a landmark rule finalized in April requiring nearly all new cars and trucks by 2029 to have advanced automatic emergency braking systems.

The Alliance for Automotive Innovation, representing General Motors ( GM ), Toyota Motor ( TM ), Volkswagen and other automakers, had said the requirement that all cars and trucks must be able to stop and avoid striking vehicles in front of them at up to 62 miles per hour is "practically impossible with available technology" and had asked the agency to reconsider it.

NHTSA rejected the request but said it was clarifying some technical requirements.