Keith calls them that because of the noise that the engines make.  They are used largely in rural situations as lightweight transport.  Limited to less than 30 miles per hour.  Local  authorities use them for street cleaning and other municipal uses. Ideal in the narrow streets of the old towns.

Various body styles can be seen. It looks as if they have been developed from a motorbike towing a trailer to the fully enclosed versions, trikes.  It is amusing to see a man driving while is wife sits in the back, wearing a crash helmet of course.

The early versions are front engined with a two part chain drive to the rear axle.  Later models have the engine mounted on the rear axle.

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