Some things are just too commonplace to get a significant hold of I would imagine.
Take for instance my local motorway, the M27. I drive that motorway daily and I am sometimes convinced that I am the only person on the motorway who is driving at 70 or under. Every day I see thousands of drivers screaming along on it at 90+ mph and often at 100 (usually someone in a shiny, super clean 4x4 for some reason). Now, I would imagine a member of the police could be on that motorway and probably catch a few thousand people driving at excessive speeds every day, hell...every hour ! , but whats the point really. Its so rife along that stretch of road that they would be just addressing 0.00000001% of the problem. Better they instead spent their time stopping violent crime.