OICA proposal to amend the parking brake provisions of the 2009 draft proposal to amend Regulation No. 13 to specify uniform requirements for towing trailers and motor vehicles which may tow more than one trailer (road train combinations). This earlier draft proposal has been taken up as the basis for work by the Modular Vehicle Combinations informal group.

OICA proposal as revised by the MVC informal group during its 4th session to amend the parking brake provisions of Regulation No. 13 to specify uniform requirements for towing trailers and motor vehicles which may tow more than one trailer (road train combinations). This work originates from a 2009 draft proposal to amend UN R13.