I wonder what are the historical circumstances that led to lack of speed limit on German federal Autobahn network. There is an advisory 130 km/h limit, but it is not mandatory one nor obeyed practically. (As a side note, Wikipedia says, there used to be a mandatory 100 km/h limit in former GDR and it was not retained after re-unification.)
Please provide the reasons (plus sources) that would differentiate Germany from
other "comparable" countries (for example, France) that did introduce the limit on some historical occasion.