The Dash --

English Review... Reading The Dash -- 1 minute Next Shared Element

Rather than thinking of the dash as being used for an "interruption," it will serve you better to frame that rule as "A dash is used for a sentence that got started and did not get finished -- broken sentence structure." This thinking will allow you to use a dash in some places that may feel uncomfortable but where it is oh so correct. Sorry.

...The black car -- was it in the right lane?
...The keys that I am holding in my hand -- do these look familiar?
...Ms. Mary Reynolds -- was she being considered for the job?

These are sentences/thoughts that got started but didn't get finished in the original form, necessitating a dash.

Happy punctuating!