(For future reference and for the benefit of your English GCSE it's 'their' duty not 'there' duty, Junad1997). I complained to TFL when I noticed that, after the free Oyster card was given to them, school children were getting on buses for 2 or 3 stops instead of walking that short distance. My point to TFL was that it is doing nothing for the children's fitness and would probably increase the number of obese children.