Turnstiles, swing gates, and full-height turnstiles are categorized as low or high, depending on the level of security.

Low gates are devices whose height does not exceed 110 cm and are intended for use in areas where pedestrian traffic control is supervised by a designated person (e.g., a doorman, guard). Examples of low gates include BR2 and GA2 turnstiles.

High gates are devices whose height exceeds 110 cm, making it difficult to pass over them (e.g., BA3 high turnstiles).