Keep to

I think 'to' is required in the context.

Keep to - is not the right phrasal verb in this sentence. Again, this is one of those sentences with nebulous meaning that may require revising. Even without "to", "keep", it is not commonly idiomatic. Perhaps, you need to say: " We need to keep practicing traffic rules", Or, we have to obey the traffic rules/ laws. Each has a slightly different meaning.

TakaIf "to" was omitted, would it still be OK

No. Use one of these:

We need to abide by the traffic rules.
We need to obey the traffic rules.
We need to follow the traffic rules.

AS, don't you think that even "keep to traffic rules" works either?

Takadon't you think that even "keep to traffic rules" works either?

......Works also. By the way, it would be nice if you could show the volunteers a little appreciation with a "thank you" occasionally.

Would it be correct to say:

- We need to adhere to the rules.
- We ought to stick to the rules.

Equally correct.

Perfect StrangerWould it be correct to say:- We need to adhere to the rules.- We ought to stick to the rules.

I have heard "keep to the rules" in the context of old parliamentary procedures (eg Robert's Rules of Order, 1915) but not in any other context. It is probably outdated language.

grammarfreak .Works also. By the way, it would be nice if you could show the volunteers a little appreciation with a "thank you" occasionally.

No. I meant "Don't you think either"?

I always show my appreciation to the verified instructors. Or at least, to those who show their nationalities on their profiles. I'm here to get the ideas of the authentic ins

AlpheccaStarsIt is probably outdated language.

I see. Thanks, AS!