## 6 Discussions  
The relationships between driving styles and intersections in this experiment are shown in Table 5. Intersection passages are assigned a driving style based on the largest portion of drivers' styles. A total of 56 intersection passages were classified as aggressive, 273 as normal, and 405 as cautious. Overall, the number of cautious driving styles was the highest, and the number of aggressive driving styles was the lowest. We noted that the driving styles of drivers at intersections were inconsistent. The proportion of aggressive driving behavior is 8%, normal driving style accounts for 37%, and cautious driving style accounts for 55%. According to the results, it can be seen that most heavy-duty truck drivers tended to be cautious when passing through intersections. This phenomenon can result due to a general concern for safety. The brake performance of heavy trucks appears to be worse than that of cars, so if they move too fast, they cannot avoid danger when they encounter an emergency at the intersection. At the same time, the danger of heavy accidents is more serious. Unlike car accidents, in case of emergency, due to the inertia of its own weight and poor braking ability, accidents with heavy vehicles, such as concrete mixer trucks, can involve serious occurrences, including rollovers, overturning, and squeezing, accompanied by high fatality rates. As a result, most of the heavy-duty truck drivers appeared to be cautious to avoid potential dangers. Another 37% of drivers appeared normal when driving. This phenomenon is mainly due to the driver's avoidance of peak driving times and bad road-traffic conditions. At the same time, due to the slow speed of heavy trucks, the speed in the dilemma area of the intersection may be lower than the minimum passing speed, so heavy truck drivers tend to travel normally and safely. The last 8%, that being aggressive driving, show that in a few cases, heavy truck drivers engage in aggressive driving at intersections. This may be due to a driver's desire to cross through the intersection within the green light phase or some other factors, such as \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Type** & **Cautious** & **Normal** & **Aggressive** \\ \hline Two-phase signalized & 0.5802 & 0.3642 & 0.0556 \\ Multi-phase signalized & 0.6610 & 0.2768 & 0.0621 \\ Stop & 0.4320 & 0.4369 & 0.1311 \\ Yield & 0.5556 & 0.3968 & 0.0476 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Probability of driving style at different types of intersection based on MNL model. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Type** & **Cautious** & **Normal** & **Aggressive** \\ \hline Two-phase signalized & 94 & 59 & 9 \\ Multiphase signalized & 117 & 49 & 11 \\ Stop & 89 & 90 & 27 \\ Yield & 105 & 75 & 9 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Distributions of driving styles at experimental intersections. there being no other passing vehicles. For heavy trucks, stopping at an intersection and then re-accelerating is a tedious process. At the same time, relatively high fuel consumption and an uncomfortable driving experience will prompt some drivers to choose to pass quickly when navigating through the intersection. Another reason is that, since most heavy-duty trucks are controlled by manual gears, frequently raising and lowering the gears will cause uncomfortable driving and reduce the service life of the vehicle. The probability of each driving style at the four types of intersection is shown in Figure 10.  
By analyzing the three driving styles, the probability of intersection types can be seen in Figure 10. The probabilities of four intersection types in the cautious style have relatively average performances. Heavy-duty truck drivers have a slightly higher probability of cautious driving at multiphase signalized intersections and two-phase intersections at 66.11% and 58.02%, respectively.