The Sterling Group, a Houston-based middle market private equity firm, completed the acquisition of Stripe-A-Zone, a provider of striping and related services on roads, highways, airports and parking lots. Financial terms were not disclosed. "In teaming with Stripe-A-Zone, we are establishing an outstanding foundation for the Frontline platform, partnering with best-in-class operators as we build a national leader in the road safety industry," Brad Staller, The Sterling Group Partner.