It is illegal to park in a way which interferes with traffic flow or obstructs or endangers other road users, for example: Opposite a continuous white line. On a footpath (either partly or wholly). Within 5 metres of a junction. Within 15 metres on the approach side or 5 metres on the other side of a pedestrian crossing or traffic lights. At a school entrance. Obstructing any entrance for vehicles except with the occupier’s consent. On a grass margin or median strip.