To 23 ports; the busiest crossings are to Rotherhithe (4 minutes, 67 times a day), North Greenwich (22 minutes, 50 times a day), Battersea Power Station (51 minutes, 48 times a day), London Bridge (16 minutes, 46 times a day), Embankment (32 minutes, 46 times a day), Greenwich (13 minutes, 45 times a day), Tower of London (11 minutes, 42 times a day) and Bankside (20 minutes, 42 times a day).