Transportation Code, §222.103 authorizes the Texas Department of Transportation to participate, by spending funds from any available source, in the cost of the acquisition, construction, maintenance, or operation of a toll facility of a public or private entity, and provides that the Texas Transportation Commission shall require the repayment of any money spent. Transportation Code, §372.002 provides that notwithstanding any other law, a toll project entity is not required to repay to the department any money contributed by the department as participation in the cost of a toll project of the entity if (1) the funds are held in a subaccount created under Transportation Code, §228.012 or (2) a toll project entity commenced the environmental review process for the project on or before January 1, 2014. This subchapter prescribes the policies and procedures by which the department will participate in the cost of a toll facility that is not under the jurisdiction of the department.