The procedure to allow the various approaches to a single course if that was all that was available has been done successfully in the past and included runs in both directions with no delays.
The key is that only one starter will release the entries as they are ready.
That gives the appropriate get ready time and prevents multiple runs in the same or different directions.
For example, if you have three starting areas running from the highway towards the mountain the single starter will release the short course vehicles first.
One of the things to do as soon as the short course vehicles begin to be released is to close off the staging lanes at the rear to limit any further entries in that lineup.
From the number of entries and the pace you can quickly estimate the time it would take and the available entries on the longer course will have suitable notice.
The short course vehicles will run and those that wish to make a return run will proceed directly to the equivalent starting area in the other direction, well off the course.
This will reduce the "Joy ride" problem that slows things up.
If you are in the pits when your segment is running and you wish to make the next available run you will take your vehicle to the appropriate staging area and assemble with those that have just completed runs and are waiting for returns.
Get in line, your competitore will help you with that.
When you have finished all the return runs on the course the starter moves to the next longer starting area. They know the estimated time that was given to them based on the pace and number of entries from the other area plus a couple of minutes for the starter to move. You repeat this method for each length of the course and the last one to run is the longest, and presumably FIA or FIM entries that have a time limit turn around.
When all of the vehicles have traveled down course and arrived at their respective staging areas you can begin the process for their return.
FIA with one hour and FIM with two hours can be run at any time because the staging areas are well clear of the course.
You would begin to run the short course vehicles going towards the highway first but you must be mindful of the return run schedule for the FIA/FIM entries.
You must fill the time available with running entries and additionally be able to clear the course for those with the turn around time frame. You must make the meet as efficient as possible and good communications will allow that with a good margin for safety.
Using this method for US National records will also spread the record holders into the certification impound area throughout the day and not jam them up after one records only session.
This will direct business to the impound area all day long and make most efficient use of the time.
An experienced starter is key to the pace, course availabilty and weather conditions that each entry is subject to and would have the final judgement before the entries are released to run.
It is impairative that he officials and the entrants be ready with no delays because you owe it to each other.