Recently, this post came up on Meta, and they brought up a good point (paraphrased):

I should have read the tour, but i couldn't even find it or even know that one existed. When you ask for help, you don't expect to first have to learn how you're supposed to do it.

I feel as though this could have been avoided if this user were pushed through the tour page immediately after sign-up. It provides a bite-sized digest that explains how the site works, and brings new users up to speed about how to best leverage this site.

Furthermore, it provides links to the full-fledged help center, which contains valuable resources like the ever-linked How To Ask? and How To Answer? pages. (Ideally, these would be linked from the tour itself, but one thing at a time.)

Would it be possible to redirect a new user to the Tour immediately after sign in or add a banner to new users that haven't read the tour yet?

Example banner: