Peremptory plea

In the common law legal system, the peremptory pleas (pleas in bar), are pleas which set out special reasons for which a trial cannot go ahead. They are the plea of autrefois convict, the plea of autrefois acquit, and the plea of pardon.

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English law apparently provides an additional preremptory plea of "special liability to repair a road or bridge", according to the Oxford Dictionary of Law -- what is this plea?