What is "quickline"

Quickline (also known as Signature Service) is a bus rapid transit service owned and operated by the Metropolitan Transit Authority of Harris County (METRO). The Quickline service began on June 1, 2009 with the 402 route (also called the QL2 route), that parallels the 2-Bellaire regular service route, which is the most heavily used bus route that METRO facilitates. Both routes run along Bellaire Boulevard.