In reply to Xharlie:
You need to carry spare fuses, spare bulbs, jack, spare wheel or tyre repair kit, triangle, hi-viz jacket, first aid kit and wheel nut wrench here in Czech. Lights on all the day. You have to buy vignete for motorways (on petrol stations). Avoid D1 motorway in peak hours (most of the day). It´ s horrible carpark because of roadwork.
Austrian police is very strict about hi-viz vest. It must fit EN 471and they control it from time to time. You must wear vest when you are leaving the car on the road. Lights on all the day. You must have triangle and first aid kit in Austria as well. You need vignette in Austria for motorways only, like in Czech. The price is simillar, 8,8 E for 10 days in Austria and 310 Czk (11,4E approximately)