Today Circula is the plan for the restriction and regulation of vehicular traffic. Vehicle restriction and regulation plan.- The plan of restriction and regulation of vehicular circulation called "Hoy Circula" ("Plan Hoy Circula"), which consists of the prohibition of circulation, within of the restriction area defined in article 14 of these Instructions, for the group of motor vehicles selected based on the last digit from your plate, for three days a week, 24 hours a day (all day).