Two important points to remember:
What state are you in, and what was the violation?
In Arizona, over 90% of the traffic laws on the books are CIVIL violations. These are not arrestable offenses. Examples are Speeding (as long as it is not 21 mph above the posted limit, which would be criminal speed), failure to signal lane change, failure to stop at a stop sign, ect. Examples of crimial traffic offenses: DUI, Criminal speed, Reckless endangerment.
In a civil traffic offense, the officer has no obligation to Mirandize the driver or any passengers, unless the contact leads him to believe that there may be CRIMINAL activity past/present/future. In which case if the officer intends to ask questions, he must mirandize, because a normal person would not feel themselves free to leave.
In a civil traffic offense, there is not guilt/innoncence. If taken to court, the officer must prove his case better than the person who allegedly commited the offense. This is called proponderence of the evidence. Basically, whichever side presents the best case wins. In crimial cases, be they traffic or otherwise, the state prosecutes, using the testimony of the officer as evidence. They must prove their case Beyond a Resonable Doubt. This is a much higher standard.
Find out which traffic laws are civil or crimial in your state. If arrested for an offense that is a civil violation, you have been the victim of false arrest.