I am building a new navigation system via breadcrumbs based on categories and sub-categories.
Example 1:
Having url like this:
http://mywebsite.com/listings-in-london-hatchback-car-for-sale-red-vauxhall
Having breadcrumbs like this:
Home Page > Listings > London > For Sale > Car > Hatchback > Vauxhall > Red
That Page has 10 red cars.
Example 2:
Having another url like this:
http://mywebsite.com/listings-in-london-hatchback-car-for-sale-vauxhall
Having another breadcrumbs like this:
Home Page > Listings > London > For Sale > Car > Hatchback > Vauxhall
That Page has same 10 cars but users may add in the future cars which are not red.
Example 3:
Having another url like this:
http://mywebsite.com/listings-in-london-hatchback-car-for-sale
Having another breadcrumbs like this:
Home Page > Listings > London > For Sale > Car > Hatchback
That Page has too same 10 cars but users may add in the future cars which are not vauxhall.
There can be similar situations for other categories. Is it bad practice ? Can it be the cause for duplicate content penalty ? What should i do for avoid any penalties ?
