cameras that detect vehicles blocking yellow box junctions are increasing congestion rather than improving traffic flow ,a study has found more than 100,000 drivers have recived penalties in the past two years for stopping in yellow box in London alone BUT transport for London have admitted that traffic flow has fallen at these junctions, with many drivers waiting a few seconds after the box emptys. but they have no plans to reverse the plot for reliving us of our cash we all know that the best way to raise cash is to hit motorist its so easy: down with cameras for revnue