This summary is not the rule. The rule text controls.
Oregon sorts violations into different groups to decide how much someone should pay in fines. There are four main categories: Class A, Class B, Class C, and Class D. Class A violations are usually the most serious and come with higher fines, while Class D violations are less serious and carry lower fines.
Besides these four classes, the law also allows for two other types of violations. Some violations are "unclassified," which means they don't fit neatly into the A through D categories. Others have a "specific fine" already attached to them by law, so the fine amount doesn't depend on which class the violation falls into.
What this means for you is simple: if you get a citation for a violation, the category it falls into helps determine how much you'll owe. Knowing whether your violation is Class A, B, C, D, unclassified, or has a specific fine can help you understand what kind of penalty you're facing.