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Officials in the northern city of Kano said they had stopped several people with "improvised helmets", following this month's introduction of the law.
Road safety officials said calabash-wearers would be prosecuted.
Thousands of motorbikes have been impounded around the country and drivers have staged protests.
Calabashes are dried pumpkin shells more commonly used to carry liquid.
Kano Federal Road Safety Commission commander Yusuf Garba told the BBC they were taking a hard line with people found using the improvised helmets.
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