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Rain and snow are typical disastrous weather on highway in winter. It is a common meteorological phenomenon that rain and snow are accompanied by wind. So, the compound condition of wind, rain and snow or other adverse weather must be considered in order to study the impact of adverse weather on driving safety. Heavy duty trucks have become one of the most popular choices for high-speed logistics in recent years because there is massive demand for cold chain logistics in the transportation market and heavy-duty trucks have lower fuel cost. However, due to the high center of gravity and large windward area, it is easier for heavy duty trucks to sideslip in the above-mentioned weather condition, which seriously affects driving safety and reduces logistics benefits. This paper studies the critical speed of truck on highway, aiming at the natural objective phenomena that rain and snow are often accompanied by wind in winter. Based on Trucksim simulation software and a certain domestic highway, this paper establishes the vehicle dynamic simulation model, and takes the maximum lateral offset of vehicle as the criterion to calculate the critical speed under the compound condition of wind, rain and snow, which provides a reliable basis for taking precautions against accidents and is of great significance in ensuring road safety in adverse weather.
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