On 30/10/2011 08:03, Basil Jet wrote:
At the crossroads of Exhibition Road and Cromwell Road SW7, traffic
approaching from three directions is now banned from turning left or right.
This is signified by the green light being a forward arrow. At other
junctions where both turns are banned you would see a vertical white arrow
on a blue background beneath the three traffic lights, but they have not
done that here.

I would expect to see 'no left turn' and 'no right turn' signs in red
circles alongside or under the green arrow.

time. So, is the new signage legal? it seems like a backward step to me.

They are legal. In principle you are disobeying the lights by turning.
The lack of signs showing the prohibitions is a very good defence.