Perfect solution for queue management. Just give the last one a 'sorry, I'm last in line' vest. All sizes available.
We are using these at a lot of events and it's, in our experience, by far the best way to manage a long queue and avoid disappointed and upset visitors. The supervisor recovers the vest before the last participant enters the activity.
Vests Last In Line
$6 per vest (regardless of number of days) | cost covers washing post event | S, L and XL