"In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the state and district wherein the crime shall have been committed, which district shall have been previously ascertained by law, and to be informed of the nature and cause of the accusation; to be confronted with the witnesses against him; to have compulsory process for obtaining witnesses in his favor, and to have the assistance of counsel for his defense."
"The right to trial by jury in a criminal case resides in both Article III, Section 2 of the federal Constitution (“The Trial of all Crimes, except in Cases of Impeachment, shall be by Jury”) and the Sixth Amendment. But the right isn’t as broad as those texts might suggest, meaning that many defendants have to settle for judge trials, where the court decides whether the defendant is guilty."
The 'rub' is that some states don't consider traffic tickets and misdemeanors as 'Crimes' and the Supreme Court (SCOTUS... the Judiciary Branch... remember them?) has upheld that repeatedly:
"According to the Supreme Court, the jury-trial right applies only when “serious” offenses are at hand—petty offenses don’t invoke it. For purposes of this right, a serious offense is one that carries a potential sentence of more than six months’ imprisonment. (Baldwin v. New York, 399 U.S. 66 (1970).) If the penalty is six months or less, the crime is serious only if the sum of its penalties are weighty enough. The Supreme Court decided in one case that up to six months’ incarceration or five years’ probation, plus a $5,000 maximum fine weren’t enough to make a certain kind of DUI a serious offense. (U.S. v. Nachtigal, 507 U.S. 1 (1993).) Likewise, in another case, it decided that a first-time DUI was merely a petty offense where:
o the maximum imprisonment was six months
o there was an alternative penalty of 48 hours’ community service while wearing DUI-offender identification
o there was a maximum fine of $1,000
o defendants had to undergo alcohol-abuse education, and
defendants automatically lost their licenses for 90 days.
(Blanton v. City of N. Las Vegas, 489 U.S. 538 (1989).)"