Amendments to the expenditure plan adopted pursuant to Section 142255 are to provide for the use of additional federal, state, and local funds, to account for unexpected revenues, or to take into consideration unforeseen circumstances. The transportation planning agency shall take all appropriate actions to give highest priority to the projects in the initial expenditure plan, and any amendments shall not delay or delete any project in the initial plan without the transportation

planning agency holding a public hearing and documenting within the plan the reason why the amendments are being recommended to the authority and are necessary relative to conditions beyond control of the authority.