Problem: On a single post, I would like to show a list of related posts from the same post type. Cars are organized using three taxonomies - Make, Model, and Series. I would like to show all the cars in the same Make and Model as the current car.
Solution: For the most flexibility, use a 4th taxonomy "Related Vehicles" and create a term for each car, where the term slug matches the car's post slug. Create a View filtered by Related Vehicle, where the term is set using a shortcode attribute. Use the current post's slug in the shortcode attribute to display a list of posts related to the current post.
For more simplicity, you can use the two taxonomies Make and Model to filter a View of Cars, where the terms are set by the current post. This approach will not allow arbitrary relationships.
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