Intrastate motor carriers of sand, rock, gravel, asphaltic mixtures or other similar road building materials shall not be required to file cargo insurance and shall be required to maintain liability insurance limits of Three Hundred Fifty Thousand Dollars ($350,000.00) combined single limit.
No carrier, whose principal place of business is in Oklahoma, shall conduct any operations in this state unless the operations are covered by a valid primary bond or insurance policy issued by a provider authorized or approved by the State Insurance Commissioner. No carrier shall conduct any operations in this state unless the operations are covered by a valid bond or insurance policy issued by a provider authorized and approved by a National Association of Insurance Commissioners and certified by the State Insurance Commission.
Okla. Stat. tit. 47, § 230.30