Home Mandatory Road Signs What is the symbol of “All Motor Vehicles Prohibited”? Driving EducationMandatory Road Signs What is the symbol of “All Motor Vehicles Prohibited”? By admin - August 16, 2022 184 0 FacebookTwitterPinterestWhatsApp This sign signifies that there should no movement of traffic in the designated area either from outside or within. This is used to decongest the area. It is also used at pedestrian areas.