The velocity model in the existing VSS standards is  based on physical calculations. The speeds  are also actually driven as benchmarks. The speeds are influenced mainly by the road geometry and the speed limits. With regard to road geometry interesting addition to the relationship between turn radius and speed, the influence of the pitch on the speed behaviour. The influence of the pitch has been studied in the past in two research papers. In this time was on roads outside cities, the general speed limit 100 km / h. Since the introduction of general speed limit 80 km / h no investigations have been carried out in hills and slopes in Switzerland.

One of the main objectives of standardization is to allow new findings are incorporated continuously in the body of standards. Such findings relate to the changes in the relationship between pitch and speed of vehicles. Based on studies of the traffic flow are therefore on roads outside cities, the relationship between the size of the pitch and the speed behaviour of cars and trucks determined and the changes compared to the previous surveys are found. Because of this the Basics gene can be assessed whether a revision of the existing standards imposes. The focus is the VSS, standards SN are 640, 110, elements of vertical lines "and SN 640 138a, additional strips in gradients".