Bold*If the wheel hadn't been invented 4000 years ago, we wouldn't have had any cars today. /*Bold what sounds right and btw is the correct form in the book is: If the wheel hadn't been invented 4000 years ago, we wouldn't have any cars today. Both forms are fine conditional forms.
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Anonymouslooks like a type 3 if-clauseNot entirely. The first part (the if-clause) is in the past so it's Type 3. The second part (the main clause) is in the present so it's Type 2. This is one of the "mixed conditionals" - 'if' in the past, the rest in the present.