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I know this is not what you want to hear, but one issue really has nothing to do with the other. The officer was presumably on duty, wearing his standard issue uniform, and enforcing the traffic laws of your city/state. Neither his uniform nor his method of stopping your vehicle will nullify the alleged violation.
The intersection not being clearly marked and the fact that the officer's view of your driving may have been obstructed by the telephone pole may play a role in your defense. You can attend traffic court and likely get the citation dismissed if you explain the poor notice provided by the sign... assuming you can demonstrate the sign is insufficient.
As to the second issue, you should take that up with the police administration. Attempting to use the officer's actions and attire as a defense to your traffic violation will not only fail but also make you lose some credibility with the department. If you approach the department and explain the issue without precondition then you will probably get someone's attention (particularly since this officer could have been hurt by a perfectly reasonable reaction to his conduct).
Please reply if I can help further.
Sorry for the delay. I was offline for a while and just got notice of your reply on my Blackberry.
I am uncertain as to your inquiry about whether or not you have a case. Do you mean the criminal case or a civil lawsuit?
I certainly would not mention "professional courtesy" in court since the exercise of unfair prejudice or professional courtesy is very common... but not exactly legal. Police are supposed to enforce violations regardless of who does the violating... even other police.
I am very curious as to why they offered a meeting over such an insignificant traffic citation. I wonder if they are possible fearful that you intend to sue the department for the officer's manner of approach. While it is possible to sue officers for not following procedures that leads to emotional or physical damages, it is a very unusual and unlikely lawsuit.
My opinion has not changed. I think you should speak with the police administration about the concerns you've raised. Photograph the intersection and present it to the court to defend yourself from this citation. The court will likely dismiss the citation with court costs (or something along those lines).
Please reply if I can help further... I will remain online for approximately another hour. Otherwise I will reply in the morning.