Modifications to adapt UN R138 for application to automated vehicles (based on text of the 02 series proposal to specify the working principles of an Acoustic Vehicle Alerting System (AVAS) and to reduce measurement uncertainties during the measurement of the one third octave bands).
Proposal to increase the potential speed reduction during the collision warning phase and clarify the interpretation of “engine start/run cycle”.
Proposal to align provisions with corresponding provisions of UN R152 and to clarify the interpretation of the provisions on system robustness when applied to heavy duty vehicles.
Proposal from GRSG to clarify the scope of the UN Regulation and to complement the text with the missing Supplement 7 to the original version of UN R116.
Proposal to clarify provisions regarding the actuation of the parking brake warning device to cover the case of electric control transmission systems where there may be a transition between parked (applied) and un-parked (released) braking states.
You can find more information about NHTSA at their website.