Same Sh*t, different day, only this particular time there is a weird bird like screaming? At about 29 seconds in:confused:, also you can see the girl in the car looking round for the source of the Horns! 
I aint got a clue what was making that noise~!! possibly a bird???
It did sound bird like. I did notice your compressor was working itself to death…LOL
Yes indeed, I had just emptied it in a previous tunnel. Its mounted in the back of the van on a wooden shelf behind the cab so it sounds bloody noisy when nearing the 150psi cut off!
LOL! Well Since that compressor is noisy I will have to say one thing… You will LOVE A York! 
anyway sounded more like a bird. It could have been a crow crowing back at you to stop but You couldn’t hear it due to the epic loudness of the shockers. xD