The Ministry of Transport experimented with double-line road markings for the first time on sections of the A20 and A3 during Easter in 1957. The markings were cautionary, and had no legal status at that time, but motorists were advised that ignoring them could weigh heavily against someone involved in an accident in their vicinity. Further, "it is in order, if safe to do so, to cross the lines only when the broken one is on your side. It is not in order to cross when the solid line is on your side or to park there." Despite the instruction about parking, it was observed that nine bus stops were located inside prohibited parking areas.