When the vehicle is not fitted with a partition or a wall, the length shall be measured from a vertical plane tangent to the rear outermost point of the top of the seat back to the rear internal pane or door or tailgate, in closed position;
I gcás nach mbeidh laindéal ná balla feistithe ar an bhfeithicil, tomhaisfear an fad ó phlána ceartingearach atá tadhlaíoch don phointe is faide amach ar bharr chúl an tsuíocháin go dtí an plána cúil inmheánach nó go dtí an doras nó go dtí an comhla chúil agus é dúnta;