Directories are a 2 bladed sword, not all are clean actually most are not very clean.
They have a pretty spammy character.
The Yahoo directory was good while it last, DMOZ never was any good.
Directories are specially good for businesses which don't have a website, they can be in a directory and being found by the public. Neat solution. But in modern SEO directories are more a no go.
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To get traffic Directories are not so good, to submit for a better standing in search engines? Well if you have an office sure. If not and they are spammy a link could harm you.