[fishguy]

Jon, the reason I wrote the 2 types of flags are command and informational flags is that was a great way it was explained to me , and so i pass it along verbatum.
the difference is, a command flag is just that...........it commands you to do something, such as a black flag, yellow flag(waving, stationary, double), red flag, meat ball flag.
informational flags are just that, they give the drivers on course information, and are open to interpretation for the driver. flags like, the surface hazzard flag(its a warning, not a comand to do something in an action), the blue/with yellow, informs of a faster car coming, but is not a command to let it pass, just check your mirros and beware, though i will allow the pass when i see that flag.
this way it makes it easy for drivers to understand that there are actions that are associated with some flags, and track awareness that are associated with others.

I do admit to not doing HPDE very long. I had racing experience prior to getting into cars, and it was really boring just mindlessly driving around on the track and not racing(for me). NASA out here is very good with their program, another grassroots local club who i wont name out of respect for the owner, (not SCCA), is just horrible.
they are racing in HPDE, I offered to instruct , but when i saw what was going on out on the track, never made myself available........no way was it safe.