The purpose of this part shall be to authorize any local authority to establish a personal transportation vehicle transportation plan for roadways and streets within the local authority's jurisdiction. It is the intent of the General Assembly that these plans be designed and developed to best serve the functional travel needs of the jurisdiction and to have the physical safety of the personal transportation vehicle occupants and their property as a major planning component. No local authority shall be liable for losses resulting from exercising or not exercising its authority to adopt a personal transportation vehicle transportation plan, failing to adopt such plan, making an inadequate plan, or negligently adopting such plan.