The Fire Depart­ment offi­cer in com­mand or any fire­man des­ig­nat­ed by him may exer­cise the pow­ers and author­i­ty of a police­man in direct­ing traf­fic at the scene of any fire or where the Fire Depart­ment has respond­ed to an emer­gency call for so long as the Fire Depart­ment equip­ment is on the scene in the absence of or in assist­ing the Sheriff’s Department.