 In addition, six Rapid Penang bus routes include stops within Balik Pulau - 401, 401E, 403, 404, 501 and 502.These bus routes link Balik Pulau with George Town, the Penang International Airport, Queensbay Mall, Bayan Baru and Teluk Bahang.Aside from these routes, in 2018, Rapid Penang launched a free-of-charge transit service within Balik Pulau, known as the Congestion Alleviation Transport (CAT).