This chapter does not apply with respect to any motor vehicle owned by the United States, this State, or any political subdivision of this State or any municipality therein, nor, except for Section 56-9-590, does it apply with respect to any motor vehicle which is subject to other laws of this State which require their owners to carry insurance or to place security in a manner which would make those owners carry insurance or place security in addition to the amounts required by this chapter.
S.C. Code § 56-9-30