Home Mandatory Road Signs What is the symbol of “Truck Prohibited”? Driving EducationMandatory Road Signs What is the symbol of “Truck Prohibited”? By admin - August 16, 2022 168 0 FacebookTwitterPinterestWhatsApp As sign itself speaks the area designated is a no entry zone for Trucks or HMV. These could be narrow lanes or congested areas where entry of heavy transport vehicle could obstruct smooth flow of traffic.