It's true, some people just don't realize and some others are even extremely inconsiderate. I have had your exact same scenario (as stated above, but without the dog and children instead) happen to me on several occasions with varying results. My handing of the situation is always the same:
Hop outta the tracker, smile and wave and say, politely:
"Excuse me folks, hate to bug ya... But is there any possibility you could do all that stuff up there?"
Then walk back to the tracker, reminding myself that I have the serenity toa ccept the things I cannot change, the strength of character to change the things I can, and above all I have the wisdom to know the difference.
Crickets obnoxious little philosophy session is concluded, now back to your regularly scheduled foruming.