All rules and safety regulations now or hereafter prescribed and adopted by the U.S. Department of Transportation, Federal Highway Administration, applicable to motor vehicles under the Federal Motor Carrier Safety Regulations as found in 49 C.F.R. Parts 383 through 399, not in conflict with the laws of the State of Arkansas, are hereby adopted and prescribed as the safety rules and regulations applicable to the intrastate operations of motor vehicles under the jurisdiction of this Commission. Notwithstanding the above, the rules and regulations governing the filing of insurance/surety for the public, specifically 49 C.F.R. Part 387.15 and 49 C.F.R. Part 387.35, shall not apply to those carriers having only Arkansas intrastate authority; in that case, those intrastate only carriers shall maintain the minimum limits set out in Rule 13.1 and HM Rule 1.4 of these rules.