What Are The People On Motorbikes In London, With Maps On The Windvisor Doing?

Recently, all around London, I have noticed there are many people on mopeds and motorbikes, that have maps taped to a pieice of plastic above the handlebars.
They are not pizza delivery people, or seem to be experienced couriers.
Does anyone know what they are doing? Are they training for something?
Are they rubbish spies?
Thanks.

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