'Pashtunwali' is not a 'law,' but a series of behavioral codes- like honoring the guests and serving them. If you can point me to where the Qur'an and Sunnah and Ijmaa' regulate the driving of a car, then be my guest... rather, it would only be necessary to pass laws on the basis of Qiyas from societal benefit, which is something from the Qur'an and Sunnah, so this is a ridiculous example.