I think the Pentonville Road bus lane used to have 'no cycling' signs in addition to these. I think someone told me that that combination was unlawful, but I'm no expert on signage and can't remember for sure what used to be up there.
Most bus lanes will have variations on this type of sign:
There should be 'bus only' sign combinations, as in this example of the contraflow bus lane in Russell (arf) Square:
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Bloomsbury+Way,+United+Kingdom&aq=4&sll=37.0625,-95.677068&sspn=29.854268,56.513672&ie=UTF8&hq=&hnear=Bloomsbury+Way,+London+WC1A,+United+Kingdom&ll=51.521448,-0.124158&spn=0.000721,0.001725&z=19&layer=c&cbll=51.521448,-0.124158&panoid=iyiniw_0Sm0zxBR0UFiMWQ&cbp=12,337.63,,0,14.45
I think the Pentonville Road bus lane used to have 'no cycling' signs in addition to these. I think someone told me that that combination was unlawful, but I'm no expert on signage and can't remember for sure what used to be up there.
Most bus lanes will have variations on this type of sign: