Measfar go gcomhlíonann leathleantóir nach bhfuil gairis nó trealamh aeraidinimiciúil dá dtagraítear i bpointí 1.4.1.1. nó 1.4.1.2. air an ceanglas a leagtar amach i bpointe 3.1 má chomhlíonann a rothfhad tagartha “RFT” an ceanglas seo a leanas:
A semi-trailer not equipped with aerodynamic devices or equipment referred to in points 1.4.1.1. or 1.4.1.2. shall be deemed to comply with the requirement set out in point 3.1. if its reference wheelbase ‘RWB’ meets the following requirement: