In order to equalize wait times for customers and workload for staff, the property greeter sends cars to lanes using a certain order. Like the first two cars might be assigned to lane #1, the next cars to lane #2, then lane #3, etc. From that perspective, the self-service lane is like any other lane. So, if you arrive and it’s time for a car to be assigned to the lane # that happens to be self-service, your vehicle will be sent to that lane. (There are some exceptions such as the greeter recognizes that the age of your vehicle cannot be tested using self-service). When the greeter assigns you to the lane, s/he will let you know that it’s a self-service lane and encourage you to ask the attendant for any help you might need.