(a)Insurers of for-hire motor carriers of passengers that are registered with FMCSA on September 30, 2016, must file certificates of insurance, surety bonds, and other securities and agreements with FMCSA by December 31, 2016. Insurers of all other exempt for-hire motor carriers of passengers must file certificates of insurance, surety bonds, and other securities and agreements with FMCSA at the time of the application for registration. These filings must be made electronically in accordance with the requirements and procedures set forth at § 387.323.