A tripod turnstile is a waist highaccess control turnstile with three revolving arms. Tripod turnstiles restrict access to one person at a time with a set of rotating tripod barrier arms. These half height turnstile gates have traditionally been the most popular type of turnstile.
Using tripod turnstiles is a popular choice when checking tickets at sports stadiums, amusement parks, and university facilities. They eliminate the need for attendants at entrances and provide a means to count the number of pedestrians entering into a facility. These turnstiles paired with card readers and electronic operation are the most popular choice for subway systems and can be found in most of them.