After thinking about this a bit longer:

Italy: quite a new law (a few months old): you must have a reflective warning vest in the car - if you have to stop on the motorway you have to wear it when you leave the car. This applies for anyone leaving the car, not only the driver. Police are controlling whether you have the vest with you!
The fine for not having a vest is much higher than the price for buying such a vest.
Also, in Italy, fines for speeding are very high
Same goes for Austria (as you want to drive in Germany and Italy, I guess you are going to drive through either Switzerland or Austria - unless you are able to make your car fly ;-))

Germany: don't use a mobile phone while driving (you may use it if you use a headset so you don't have to hold the thing in your hand).

Italy/Germany: use the safety belt - you might have to pay a fine otherwise.

Btw, whereabouts in Germany are you going to be?