Turnstile, tripod turnstile or speed gate: which one do I need?

The tripod turnstile is cheap and robust, lets people through one at a time and is awkward with suitcases, trolleys or pushchairs; on its own it is not accessible. The full-height turnstile goes where there is nobody watching —a staff entrance to a floor at night, a perimeter gate— because it really does stop people, and in exchange it is slow and oppressive. The speed gate, with swinging or sliding leaves, is the fastest, takes a wheelchair, detects two people going through and raises an alert, but does not physically stop anybody who decides to jump it.

Two things are never missing. An accessible route on every line of turnstiles, because if there is not one a side door ends up being opened and that cancels everything. And the evacuation sorted: the speed gates have to open and stay open on the fire signal, and the tripod turnstiles have to be left releasable. A gate that locks with people inside when the network goes down is a bigger problem than the one it came to solve.