The Sheriff of Harford County may retain a current list of all duly licensed towing operators. Whenever the services of a towing vehicle shall be required and a request is made to a law enforcement agency concerning such services, the law enforcement agency shall call the licensed towing operator for that geographically assigned area who is shown to be next assigned by a rotation list, except when an owner requests a specific towing company provided that such tow company can respond within a reasonable time. If the vehicle is a traffic hazard or obstructing traffic and the company cannot respond within the time specified in this chapter, the next assigned tow company based on the rotation list for that geographically assigned area shall be called and the owner of the vehicle shall be subject to the fees prescribed in this chapter. In the event the towing operator does not then have a towing vehicle available for service, the law enforcement agency shall call the next towing operator and so on until a towing vehicle has been secured. If a towing vehicle does not arrive at the scene of a collision or accident within twenty (20) minutes after request is made, the officer at the scene shall notify the law enforcement agency of such fact. The law enforcement agency shall then contact the towing company to ascertain the cause for the delay. If the law enforcement agency is not reasonably satisfied that the towing vehicle will arrive at the scene within five (5) minutes after the second call, it shall contact the next towing company on the rotation list for the assigned geographic area, etc., as if the first towing company had not been contacted. Consideration will be given, however, to abnormal traffic patterns that result from adverse weather conditions, emergencies, or other causes. Upon arriving at the scene of an accident, the towing operator shall immediately remove the disabled vehicle to the operator's storage lot or to a place of the owner or operator's choosing. In the event a disabled vehicle cannot promptly and efficiently be removed from the scene of an accident, the towing operator may call another licensed tow company to assist in such removal. A towing company shall be required to release a disabled vehicle only during the regular business day, but may release such a vehicle to the owner at other times.