In Austria, specific speed limits apply to three different type of roads. The maximum speed limits in Austria are 50 km/h on urban or inner-city roads, 100 km/h on rural roads and 130 km/h on motorways. These maximum speed limits are often reduced for specific sections of roads or even large parts of cities due to local circumstances or environmental objectives. For example, the speed limit for many inner-city roads in Austria is set at 30 km/h. Lower speed limits also apply to trucks. A higher speed, for example 160 km/h instead of 130 km/h,leads to a significant increase of fuel consumption and CO2emissions by 20 - 25%. For vehicles with diesel engines, particulate matter increases by 50%.