I agree with Dick and Ray. Most imortant, you need to read and understand the GCR (and any sups for an event). Then analyze various scenarios that you have witnessed or been a part of, how the rules apply, and then decide what you would/should have done.
Does anyone remember the video that was posted here about a year ago titled 'I Was Seventh!'. Here was this driver who got gridded in the wrong place, in this case ahead of the sixth place car. As the cars rolled off the grid, he indicated for the grid worker to release the sixth place car ahead of him. When he went to move, the grid worker held him in place, and let the entire rest of the field - about forty cars - proceed ahead of him. Talk about getting hosed! Well, the driver tried to correct the mistake by passing almost the entire field on the pace lap! Funny video! Of course, he was excluded from the results, and did not get credit for a finish.
Here are a bunch of wrongs, none of which can be combined to make a right situation. 1) the grid worker reversed the sixth and seventh place cars. 2) the sixth place driver did not know he was out of place. 3) the seventh place driver knew he was out of place - at what point he knew, I don't know - but did nothing to correct the situation until the grid stated to move onto the track. and 4) the seventh place driver tried to regain his position in the field after moving onto the track. What would you do? You make the call.
Please remember that everone at the track is human and subject to making mistakes now and them (I seem to remember making one, back in '69 I think

no, that was in '70) And that we sign a statement on every entry form that we will abide by the GCR and sups. We must depend on the officials and workers to direct our actions, and need to pray that they have the wisdom and experience to do it right as much as possible, to keep us safe.
Let's go racin"!!!!!!! Safely!!!!!