What do you expect them to do? What would you like them to do? There are over 408 primary schools in Essex, and I bet most have a perceived safety problem. Send a police car to every school every morning? Or a traffic warden?
Whenever we checked speeds outside schools, having been told parents were speeding, the actual speeds were very low. You will always get the idiot, no amount of policing will prevent that.
At the end of the day, the perception is that there is danger but he facts are that schools are very safe.
Government regs allow us to send our kids to schools outside the traditional catchment areas, meaning that kids have to be ferried to and from, hence the vehicle increase.