S.C. Code Ann. § 56-5-760
(B) The driver of an authorized emergency vehicle may:
(C) The exemptions in this section granted to an authorized emergency vehicle apply only when the vehicle is making use of an audible signal meeting the requirements of Section 56-5-4970 and visual signals meeting the requirements of Section 56-5-4700 of this chapter, except that an authorized emergency vehicle operated as a police vehicle need not use an audible signal nor display a visual signal when the vehicle is being used to: