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Kham,
do you ever think that if you paid attention to what police told you then you might know what you did wrong? you obviously did something and for the 800th time you are claiming complete innocence... Grow up... Once or twice maybe, but it was like 6 times a summer up until last year...
Why don;t you track down the cop and ask him what you did, because i am sure it was somewhere in the "Bla Bla Blah's"
and BTW Yield means that whoever has the sign must join the traffic at any point that it will not interfere with the normal flow of the traffic already on the road and if that means come to a complete stop then thats what you have to do. No room for interpretation, thats just the way it is.