The vehicle's directional signals (commonly known as blinkers or indicators) are often used as a way to announce one's intention to turn, thus alerting other drivers.
He showed an unpleasant side to his character by attempting to bite the rider of the winner during the race, and was fitted with blinkers from then on.
Like blinkers, it partially restricts the horse's vision, and helps him to concentrate on what is in front of him, rather than objects on the ground (such as shadows).
