Queuing systems are designed for the sole purpose of controlling queues. Queuing systems are efficient and systematic in that they allow uniformity, following the first-in-line-first-go principle. Queuing systems prevent people from being jostled about, in short allowing for a patient stand-in-line. Queuing systems also uses the physical barrier system, aimed at guiding queue formation and organizing it in the most efficient way. Queuing systems also make use of signage and signaling systems which provide information to people queuing to aid efficient queue formation and flow, as well as setting service expectations. Queues are structured, such as those at supermarket checkouts, banks, airport security and so on. Often, queuing systems set up tickets-ranking which allows for a stress-free waiting, without standing in a line.