To 18 ports; the busiest crossings are to North Woolwich (5 minutes, 64 times a day), Barking Riverside (8 minutes, 26 times a day), Royal Wharf (7 minutes, 24 times a day), North Greenwich (11 minutes, 24 times a day), Greenwich (21 minutes, 24 times a day), Masthouse Terrace (26 minutes, 24 times a day), Surrey Quays (31 minutes, 24 times a day) and Canary Wharf (35 minutes, 24 times a day).