I read this statement by the senior police officer for our area as an explanation why the road is closed after an accident.I can understand them closing a road to protect the emergency services or if a fatality had occurred but not this "its a crime scene" explanation,particularly when an accident a few years ago on the main north/south route occurred and the road closed causing people a 50 mile diversion round it to get 9 miles north.A van had run into a hedge and overturned,and the driver was uninjured yet the road was closed for over 9 hours.
Maybe the vehicle had been involved in a crime, if so then it is a crime scene.
If it was a criminal,then surely he'd have been arrested at scene not stood with several other very irate motorists asking why the road had been closed for around 3hrs(with a further 6hrs left before it reopened)
The term 'preserving the scene of a crime' springs to mind! There is the possibility if it had been involved in a crime of forensic evidence to be collected, to have that evidene destroyed by passing motorist would defeat the object!
Here,its EVERY accident and our infrastructure is pretty dire as there's lots of bloody great mountains everywhere so closing the main route through the county for 9 hours because a works van had crashed was just one example of a needless closure.