curricle
A fashionable open-air owner-driven two-wheeled sporting vehicle designed for a pair of horses and seating for no more than two (ie the Regency equivalent of a two-seater convertible sports car). There was a small seat in the rear for a groom or “tiger”.
The painting shown is “A Gentleman with His Pair of Bays Harnessed to a Curricle” by John Cordrey, 1806. Yale Center for British Art.