The autos and bare tables seem to run as needed, but I have usually seem a rise in activity heading south generally end of month/beginning, occasionally mid month. No set time, but I have noticed a trend from early morning till late morning here in Morgan Hill. They usually head south before the morning Caltrain commute or right after #11 heads south. Nothing set, but I hope this helps. The evening sees north bound Salinas Hauler and Rock Job, back south in the wee hours! Happy hunting!