Someone really should paint a "wombling free" sign underneath these.
http://www.flickr.com/photos/suburba...astlondonline/
[nitpick mode]
Perhaps im being a bit fussy, but to my mind wouldnt it be better/more
logical for the "overground" sign to be over the "underground" rather than
under as in the above picture?
And the colours or rings are too simmilar.