791-acre (3.2 km2) Hampstead Heath of North London. This incorporates Kenwood House, the former stately home and a popular location in the summer months where classical musical concerts are held by the lake, attracting thousands of people every weekend to enjoy the music, scenery and fireworks. Buses London's bus network is one of the largest in the world, running 24 hours a day, with 8,000 buses, 700 bus routes, and over 6 million passenger journeys made every weekday. In 2003, the network's ridership was estimated at over 1.5 billion passenger trips per annum, more than the Underground. Around £850 m is taken in revenue each year.London has the largest wheelchair accessible network in the world and, from the 3rd quarter of 2007, became more accessible to hearing and visually impaired passengers as audio-visual announcements were introduced. The distinctive red double-decker buses are internationally recognised, and are a trademark of London transport along with black cabs and the Tube.
s 'Fortunately, it is not necessary to use so deceptive an approach as the low-ball technique to employ the power of the commitment/consistency principle in public-service campaigns. An impressive se- ries of studies by Richard Katzev and his students at Reed College has demonstrated the effectiveness of commitment tactics like written pledges and foot-in-the-door procedures in increasing such en- ergy conservation behaviors as recycling, electricity usage, and bus ridership (Bachman &. Katzev, 1982; Katzev &. Johnson, 1983, 1984; Katzev &. Pardini, 1988; Pardini &. Katzev, 1983-84). DEFENSE _ Defense The only effective defense I know against the weapons of influence embodied in the combined principles of commitment and consistency is an awareness that, al- though consistency is generally good, even vital, there is a foolish, rigid variety to be shunned
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