Each district commander will outline geographical areas within their district to be designated as tow zones. The geographical tow zones for each patrol district will be filed with the patrol. The boundaries established pursuant to this action may be modified as circumstances warrant. Considerations may include, but are not limited to, such factors as the frequency and severity of collisions and the frequency of DWI arrests in various areas throughout the district, the volume and pattern of traffic, the availability of tow services, and the accessibility of tow services to the areas of need within each district. Nothing herein will prevent the patrol from amending tow zones from time to time as required by changing traffic and collision patterns and other such factors affecting the adequacy of towing service available to the patrol.