Who goes first?

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We were sat in a long traffic queue on the road from Sowerby Bridge up the Calder Valley. Coming towards us sirens blaring and lights flashing is an ambulance.

Looking in my rear view mirror, I see more flashing lights and a different siren - it's a cop car charging up the valley.

Who should get priority I wonder as the two vehicles rush towards eachother?

Am I alone in being quite angry at the ambulance pulling onto the pavement letting the police car through?

....