Vehicle traffic back round noise

that is a very difficult thing to do.

Can you get the actor to dub a new audio/voice track...?

You can't really eliminate noise without creating a lot of "digital artifacts". However there's a combination of things you can try.

Add a Levels > Adaptive Limiter and dial down the Input Scale all the way, then dial up the Gain (this will crush a lot of noise below the "noise floor" then raise what's left again). Add an EQ > Channel EQ and in the dialog, suppress frequencies less than 500 Hz, increase frequencies around 1K - 3K slightly (to boost the vocal ranges), and you might want to increase frequencies over 15K (for harmonics, overtones, etc.)

to about

...or something like it (no two sources are the same.) [For the second one, I reduced the volume of the clip in the storyline and increased the gain in the EQ.]

You don't want to "notch" out frequencies too severely as it will just sound too weird.

luv tho logic windows

luv how much of logic Apple put into fcpx!