When renting the car, they will ask if you want to buy Austria's highway vignette. I didn't buy it; instead, I selected toll-free routes on the GPS, and it worked perfectly. The road conditions were great, and you could even stop along the way to take photos. When picking up the car, make sure to carefully record a video of the entire vehicle condition, especially the front, rear, and undercarriage. When I returned the car, they claimed there were a few damages and asked for evidence if it wasn't new damage. Luckily, I had recorded a video that proved those were old damages, so the rental company refunded my deposit without further questions.