It depends if the operator was quick enough to get out of the van, leg it across to the other side of the bridge and write down your number before you were out of sight - which is VERY unlikely.
Out of interest, (roughly) how fast?
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Watch my speed? I'd rather watch the road!
90 mph indicated on the speedo, taking into account the built in tolerance of about 10%, means you were probably doing 81/82 mph... I doubt they even gave you a second look.
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Watch my speed? I'd rather watch the road!