Roadblocks are frequently used to control taxpayers. For instance, barriers are
used to control buyers of certain crops like cashew nuts in the Coastal Region.
The buyer has to produce receipts before they are allowed to transport the
purchase outside the district. Similar checkpoints are used to control people for
‘development levy’ and bicycle tax. Roadblocks may also be used to collect
market fees, implying that the fees have to be paid before the goods enter the
market place.