Notwithstanding any other provision to the contrary, any person who is required to file a bond pursuant to any provision of this Act and who has continuously complied with all provisions of this Act for 48 or more consecutive months, shall no longer be required to comply with the bonding provisions of this Act so long as such person continues his compliance with the provisions of this Act. This provision does not apply to motor carriers subject to the provisions of Sections 13a through 13a.5 of this Act.