When a general vendor has received notice to temporarily move from any location where exigent circumstances exist, such general vendor shall immediately stop all vending business and within one minute begin to and as quickly as possible move his or her goods, vehicle, pushcart or stand from the entire area in which the exigent circumstances exist as determined and stated by a police officer or other authorized person giving such notice to move. A general vendor shall not return to the area of the exigent circumstance while such condition continues to exist. In the absence of a statement to the contrary by an authorized person, it shall be presumed that the exigent circumstances will continue to exist in such area for a period of two hours from the time notice to move was given to the vendor.