A dozen CCTV cameras will provide police with a second by second film of Cristiano Ronaldo’s Ferrari horror smash.

It emerged yesterday officers may quiz the 23-year-old over allegations of careless driving.

Such a large number of cameras were installed in the 300 yard tunnel because of the terror threat to Manchester Airport and its runway directly above the tunnel.

Accident investigators are expected to examine the footage in minute detail to determine exactly why the Manchester United ace crashed his £200,000 supercar.

Officers are also probing claims the Portuguese star moved down a gear in his new Ferrari 599 as he roared into the tunnel on Thursday morning.

And they have been examining large skid marks still visible on the road to see if the star was driving within the 50mph limit.