A queue is a length before it is anything else
Two hundred and forty people at two and a half feet each is six hundred feet. That is a fifth of a mile of humans, and the only reason it does not feel like it is that somebody folded it. Fold it into forty foot lanes and you get fifteen lanes; at four feet of pitch that is a block sixty feet wide by forty deep, or 2,400 square feet of floor doing nothing but holding people who are waiting.
Most lobbies do not have 2,400 spare square feet. That is the number worth having before the event rather than during it, because the alternatives — a longer lane, a tighter pitch, more service points at the front, or a timed entry that never lets the line get that long — all have to be chosen in advance.
The two inputs that move it and the one that does not
Spacing per person is the biggest. Everything scales off it linearly, and two and a half feet is a compact adult line with nothing in anyone's hands. Put luggage, pushchairs or dogs in it and four feet is closer, which turns 600 feet into 960 and fifteen lanes into twenty-four. Same crowd, sixty percent more floor.
Lane length is next. Longer lanes mean fewer of them and a narrower block, and the limit is whatever straight run the room actually gives you. Halving the lane length from forty feet to twenty doubles the lane count to thirty and the block becomes 120 feet wide by 20 deep — the same 2,400 square feet, a completely different shape. Which shape fits is a room question.
Pitch is the input that costs floor and buys nothing. Going from four feet to five leaves the lane count untouched and adds 600 square feet. It is set by what has to be able to pass along a lane rather than by anything about queueing, and it is the field to be honest in rather than optimistic.
Why the post count is always higher than people expect
Fifteen lanes need sixteen barrier runs, because the lanes are the gaps between the runs and gaps always number one less than the things making them. Each forty foot run at six and a half feet of rope is seven ropes and eight posts. Sixteen runs of eight is 128 posts and 112 ropes, for a line of 240 people.
Setting the two outside runs against a wall or an existing barricade takes it to fourteen runs and 112 posts, and costs nothing but putting the queue against a wall. That is why real queues hug walls.
The line looks shorter than it is
Standing at the back of a sixty by forty block, the front is seventy-two feet away in a straight line. The walk is six hundred. That ratio — a bit over eight to one at the defaults — is exactly why a serpentine feels tolerable and a single straight line of the same length does not, and it is the entire reason the layout exists. It is also why people underestimate a serpentine badly and get annoyed a third of the way through.
The front has to be able to absorb it
Four points of service at thirty seconds each clear 480 an hour. A 240 person line takes thirty minutes to empty if nobody else joins, and it stays 240 long only if arrivals happen to run at 480 an hour too. Enter an arrival rate that does not match and the page says so, because a queue length is not a free parameter — it is arrivals times wait, and the wait is set by the front.
None of that is a crowd safety plan. Pressure in a dense standing crowd injures and kills, a barrier run laid across a route people would leave by is a hazard rather than a layout, and none of the arithmetic here has anything to say about either. That work belongs with the venue and the authority that permits the event.
Questions people ask
How many stanchions do I need?
Runs times posts per run. A serpentine of N lanes takes N plus one barrier runs, and each run takes the rope count for its length plus one. Fifteen lanes of forty feet with six and a half foot ropes is sixteen runs of eight posts, or 128. Putting the two outside runs against a wall takes it to 112, and costs nothing but siting the queue against something that is already there.
How much space does a queue of 200 people take?
At two and a half feet each that is 500 feet of line, which folds into thirteen forty foot lanes and a block 52 feet by 40 — about 2,080 square feet. The spacing is the number that governs it: at four feet per person, which is realistic with luggage or pushchairs, the same 200 people want 800 feet of line and twenty lanes.
How far apart should the lanes be?
Far enough for whatever has to pass along them, which is a decision you make about your own event and your own guests. It is worth being clear about what that dimension is not: it is not an aisle width, an egress width or an accessible route dimension. Those are set by the code your jurisdiction has adopted, appear on your approved plan, and are nothing this page knows about or checks.
Why does a serpentine feel shorter than a straight line?
Because the distance you can see is not the distance you walk. At the defaults the front of the line is 72 feet away across the block and 600 feet away along the rope, a ratio of about eight to one. That is the whole design intent, and it is also why people misjudge the wait and get restless partway through.
Does this tell me if my queue layout is safe?
No. It counts posts, rope and floor at the dimensions you typed and nothing else. Crush pressure in a dense standing crowd is a real mechanism that injures and kills people who cannot move, and a barrier line laid across an exit route makes an ordinary evacuation dangerous. This page gives no procedure for either and is not a crowd management plan. That work belongs with the venue and the authority that permits the event.