Sterling-backed Frontline Road Safety, a pavement marking services provider, completed the acquisition of Apply-A-Line, a provider of road and airport striping solutions primarily in the Northwest United States. Financial terms were not disclosed. "Given its position as a market leader in its core markets, and longstanding track record of operational excellence, Apply-A-Line is a key component of Frontline’s growth strategy as we build a national leader in the road safety industry," Brad Staller, The Sterling Group Partner.