A tannoy system in a car means the driver can alert people causing obstruction in the road.
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Brief item showing a man driving a car down a quiet street. A horse and milk (?) cart is parked across the road; the car driver seems to speak into a tannoy microphone in the car, asking the milkman to clear the way - he does so. The motorist seems to use the same method to alert a pedestrian who walks into the road while reading a book.
Note: this may belong to a different issue.