All horse drawn vehicles must have brakes
Each horse-drawn vehicle engaged in carrying loads on the streets and highways of the District shall be equipped with an effective brake.
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It is illegal for taxi drivers to carry rabid dogs or corpses.
This is part of the Public Health (Control of Disease) Act 1984, sections 33 and 34: Public Conveyances. An interesting discussion regarding this law (and a few others) can be found here.