Meaning of Symbols/Icons on Amgen-ToC Stage Maps Can someone help parse the symbols on the stage maps for Amgen-ToC?  

There does not seem to be a legend on any of the maps.  e.g. http://cdn.amgentourofcalifornia.com/uploads/images/2017stages/AmgenTOC17_Stage-02_012617.pdf


Some seem pretty obvious: 


Blue circle with right-pointing white triangle  =  Stage Start 
Red circle with 1 to 5 or "HC" : Climbs with difficulty-category 
Red circle with checkered square : Stage finish


One I'm less certain of: 


Blue circle with knife/fork : Safe for riders to take food here (long flat straight stretch)???


Two I have no idea:


Green circle with white "S" : ???  (maybe some sort of points/premium spot?)
Blue circle with "Km 0" (about 10 km after the start) : ??? 


After lots of searching, I've found that last year's maps use the same symbols, but again without any legend.  I found another site on which someone asked a similar question about the Tour of Switzerland, but some of those symbols are different.

Can anyone help me out here?   Thanks!
RED Circle with numbers 1-5 : Climbs with range of difficulty

RED Circle with numbers "HC" : Hors catégorie or Above Category

Blue Circle with knife/fork : Feed Zone where you grab your musette

Green Circle with white "S" : Sprint Zone

Blue Circle with "km 0" : Just means no break-away is allowed before this point. In essence "the race starts here"