Well, darling, the plural form of "traffic rule" is "traffic rules." It's not rocket science, honey. Just add an "s" at the end and voilà, you've got yourself a plural. Now go out there and follow those traffic rules like the responsible citizen you are!
The plural form of plaintiff is plaintiffs.
The plural form of runaway is runaways.
Cases is the plural for case.
The plural of truancy is truancies.
The plural of jury is juries; the possessive plural is juries'.
The uncountable noun 'traffic' is treated as a singular form; for example:The traffic is heavy at this time of day.The traffic in cute kitten videos just grows and grows.
Traffic is a noun - the plural form is still 'traffic' (no 's' on the end). "There is a lot of traffic on the road."
Traffic is a mass noun, it has no plural form.
Rules of thumb
agenda
The regular plural form of a noun adds (s) or (es) to the singular noun.
"Chief" is a singular noun with its own unique plural form, which is "chiefs." It follows the standard rule for forming plurals in English, where most words simply add an "s" to show they are in plural form.
The plural form of "rose" is "roses." In English, most nouns form their plural by adding an "-s" or "-es" to the singular form. In this case, the noun "rose" follows this rule and simply adds an "-s" to become plural.
The plural form of "radish" is "radishes." In English, most nouns form their plural by adding the suffix "-es" or "-s" to the singular form. This rule applies to regular nouns like "radish."
The plural form of "steward" is "stewards." In English, most nouns form their plurals by adding an "-s" or "-es" to the singular form. "Steward" follows this rule and simply adds an "-s" to become plural.
The possessive form of the plural noun humans is humans'.Example: The humans' safety is our first priority in traffic planning.
The plural of rule is rules.