Having just stumbled across some old box junction threads on here, I'm posting this in case it helps anyone in future. The Highway Code guidelines for box junctions are an inaccurate interpretation of the law, which says - "Prohibition conveyed by markings in diagram 1043 or 1044 7. - (1) Except when placed in the circumstances described in paragraph 8, the road markings shown in diagrams 1043 and 1044 shall each convey the prohibition that no person shall cause a vehicle to enter the box junction so that the vehicle has to stop within the box junction due to the presence of stationary vehicles. (2) The prohibition in sub-paragraph (1) does not apply to any person - (a) who causes a vehicle to enter the box junction (other than a box junction at a roundabout) for the purpose of turning right; and (b) stops it within the box junction for so long as it is prevented from completing the right turn by oncoming vehicles or other vehicles which are stationary whilst waiting to complete a right turn." The Traffic Signs Regulations and General Directions 2002, Schedule 19, Part II, 7 My understanding of this is - Legal to stop - Turning right and not blocked by stationary vehicles Turning right & oncoming traffic Turning right & queued behind vehicle turning right Not turning right and not blocked by stationary vehicles Illegal to stop - Not turning right and blocked by stationary vehicles Legal to remain stationary - Turning right & oncoming traffic Turning right & queued behind vehicle turning right Not turning right. Illegal to remain stationary - At head of a queue turning right & no oncoming traffic