As it pulls into a bay at the Trafford Centre bus station, the yellow, single-decker bus looks like any other Bee Network service.
Yet on the front, there is no destination displayed. And other than a few observers, the only passengers on board, are four uniformed police officers.
This is the police's latest weapon in the fight against driving offences.
For the next few hours, it will become the equivalent of a mobile camera.
As it slowly weaves its way through traffic in and around Manchester city centre , the officers will use it as a vantage point from which to spot, record, and deal with those believed to be breaking the law in their vehicles.
One officer stands at the front next to the driver's cab. To the untrained eye, it looks as if he is waiting to get off. But instead, he