Subject to § 6-106.11 of the Illinois Vehicle Code, school boards may enter into contracts for any period of time deemed appropriate by those school boards for transportation of pupils to and from school; however, no contract, inclusive of any proposed renewals, may exceed 10 years. All contracts for a period of time greater than 5 years that do not include the use of electric vehicles for pupil transportation shall include a termination option after 5 years. Nothing in this Section prohibits contract opener clauses for any purpose from being included in the contract. A contract for pupil transportation that utilizes a significant percentage of electric vehicles may be entered into by a school board for up to 15 years if the contract relies on capital or infrastructure purchases or improvements that cannot reasonably be justified in a shorter-term contract.