bridle gate

plural bridle gates

1. A gate designed to allow riders on horseback to pass through without dismounting.

   He had entered by the bridle-gate which admitted to the park on this side, and cantered over the soft turf almost in the tracks of Fitzpiers’s horse […]

   1887, Thomas Hardy, chapter 1, in The Woodlanders, volume 3, page 12

   1 more example

   Then the cavalry began to move off round the top of the wood, and Ophelia ushered him through the bridle gate, turning her own horse to shut it behind them.

   1934, T. H. White, chapter 10, in Earth Stopped, page 102