To 22 ports; the busiest crossings are to Embankment (8 minutes, 36 times a day), London Bridge (9 minutes, 36 times a day), Canary Wharf (24 minutes, 36 times a day), Battersea Power Station (27 minutes, 36 times a day), North Greenwich (47 minutes, 36 times a day), Bankside (4 minutes, 33 times a day), Tower of London (13 minutes, 33 times a day) and Greenwich (37 minutes, 33 times a day).