For the election of the bituminous binder the Strategic Highway Research Program SHRP, a new concept in the USA and Canada has been introduced. Here, the binder is determined by the following temperatures for a particular object

• Maximum temperature of the top layer: the average daily maximum temperatures of the covering of the hottest 7-day period at a depth of 2 cm
• Highest temperature for base courses: average of daily maximum temperatures of the covering of the hottest 7-day period at a depth of 7 cm.
• Deepest first temperature for top and base course: the deepest daily average temperature on the surface measured.

For the USA and Canada the aforementioned critical temperatures were shown in tables, thus, the road builders can make the choice of the bituminous binder, among others due to the climatic data.

In the research project are similar  tables for Switzerland developed. Based on 440 stations and taking into account the different climates and the local climatic locations (buildings, forest, bridge), climatic basics for Switzerland is to be drawn up.