1, Yes you will hear traffic fine - apparently you can actually hear things like that BETTER with the plugs in. You don't want tinitus
2, No
3, I use the foam ones that can be washed so are dead cheap. They come in different ratings and I got a set with a high rating. Main thing is to make sure you put them in properly.
Only trouble I have with earplugs is wax build up but I use this audiclean stuff so that I don't need syringing.
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