Our club started Autoslalom in 2011 and we have slowly been growing. We are now getting around 25 average competitors at our events and are thinking of offering permanent car numbers.
We currently give numbers at each event in consecutive order, as people register, beginning at #1 and queue cars in that same order (i.e. 1,2,3,... 25). This way you always know where you fall in the grid order. Say you are #17 and car #15 is on the course, you know to start heading up to the starting line.
When assigning permanent numbers, the above system goes out the window in exchange speeding up registration since there is no need to re-assign car numbers at each event.
How do other clubs queue their cars and let drivers know their spot in the queue with a permanent number system?