WASHINGTON, Nov 25 (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.