I think the size also makes a difference. Each speeding ticket is a small sum that isn't worth the travel to fight. Losing an entire car is several orders of magnitude more expensive. Since Austria already has speeding tickets, I'm not sure what point you are trying to make.

The issue in Menifee is that tickets were issued for speeding violations that were in the "acceptable" speeding range of less than 10mph over. No exaggeration was required because speeding small amounts was ubiquitous. Personally I like people to drive the actual speed limit and don't think consistent minor speeding should be as socially acceptable as it is. However, the article explains to the new law only applies in cases of extreme speeding and only when there is documented proof of such. Personally, I think criminal charges, jail time and permanent license revocation are also called for when someone goes 135 on a 80 mph road (barely sufficient to warrant permanent vehicle confiscation under the Austrian law under discussion.)

As I alluded to, civil forfeiture is very different in that you have you prove your innocence rather than having the presumption of innocence.