The availability of optional extras depends on the car rental agent in Simmering and even if they are booked online they are not guaranteed. The following extras can be booked on Autoprio.com: Additional driver, Roof Rack, Child toddler seat, Ski Rack, Luggage racks, Electronic toll pass, Booster seat, Snow Chain Set, GPS – Satellite Navigational System, Snow Tyres, Infant child seat and Wi-Fi Access. Please note that most of the optional extras are not included in the rental price and can be purchased at the time of booking or at the rental desk in Simmering. The cost of the optional extras are displayed at time of booking in the Rental Conditions.