To 22 ports; the busiest crossings are to North Greenwich (38 minutes, 50 times a day), Canary Wharf (15 minutes, 48 times a day), Embankment (16 minutes, 48 times a day), Battersea Power Station (35 minutes, 48 times a day), Tower of London (4 minutes, 43 times a day), Greenwich (28 minutes, 43 times a day), Bankside (4 minutes, 42 times a day) and Westminster (20 minutes, 38 times a day).