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Regulations for Emissions from Vehicles and Engines

Final Rule for Final Regulations for Revisions to the Federal Test Procedure for Emissions From Motor Vehicles

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Rule Summary

On October 22, 1996, the final rule on Motor Vehicle Emissions Federal Test Procedure Revisions was published in the the Federal Register. This rule revises the tailpipe emissions portion of the Federal Test Procedure (FTP) for light–duty vehicles (LDVs) and light–duty trucks (LDTs). The primary new element of the rulemaking is a Supplemental Federal Test Procedure (SFTP) designed to address shortcomings with the current FTP in the representation of aggressive (high speed and/or high acceleration) driving behavior, rapid speed fluctuations, driving behavior following startup, and use of air conditioning. An element of the rulemaking that also affects the preexisting "conventional" FTP is a new set of requirements designed to more accurately reflect real road forces on the test dynamometer.

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