## 6 Discussions
In the few stop intersections on the test route, drivers frequently did not accelerate and decelerate since doing so at unmanned parking intersections causes relatively high fuel consumption and uncomfortable driving experiences. According to the above identification results, the distribution of different types of driving styles at intersections is shown in Figure 11. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Intersection Type** & **Cautious** & **Normal** & **Aggressive** \\ \hline Signalized & 211 & 108 & 20 \\ Proportion of signalized & 62.24\% & 31.86\% & 5.90\% \\ Unsignalized & 194 & 165 & 36 \\ Proportion of unsignalized & 49.11\% & 41.78\% & 9.11\% \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Differences in driving styles between signalized and unsignalized intersections. Figure 11: Hotspot map of intersection driving-style distribution: (**a**) cautious, (**b**) normal, and (**c**) aggressive. The distribution of cautious and normal driving styles are close to the same, but the aggressive driving style is concentrated at the intersections shown in the figure. As shown in Figure 11a,b, drivers tend to drive cautiously and normally at most intersections, especially at intersections in urban areas (points highlighted in red in the figure). In contrast, Figure 11c shows the intersection locations where aggressive driving by drivers occurs with high frequency. These intersections can be considered as potential crash areas and are therefore judged to be potentially dangerous. Through this method, potentially dangerous intersections can be identified, thus warning drivers in advance and allowing road managers to make changes so as to reasonably control and improve driving safety. According to the discussion above, it can be concluded that:  
1. Aggressive driving styles mostly occur at stop intersections and in the dilemma area of signalized intersections. In response to this phenomenon, stop intersections on road sections where heavy-duty trucks travel frequently should be set up after careful inspection, and corresponding warning signs need to be added. At the same time, it is necessary to use on-board GPS and on-board smart devices to carry out active warnings, such as voice warnings, to prevent drivers who have frequent aggressive driving styles. Considering the dilemma area at signalized intersections, reasonable signal phase, suitable position arrangements, and suitable signal intersection structure design can help improve drivers' safety and their performances. 2. Drivers tend to be more cautious at signalized intersections, so it is necessary to promote safe operation rules. It is also necessary to strengthen the maintenance of the corresponding infrastructure for heavy-duty trucks as they are more destructive to the road. 3. Drivers drive cautiously at yield intersections. Yield intersections are usually set at intersections with lower branch-road grades. At this time, the probability of pedestrians crossing the street is relatively high. Using a cautious or normal driving style could help drivers to improve safety. To sum up, all four types of intersections have influences on drivers' driving styles. The driving style of one driver is not always constant and can change due to different intersection types, road conditions, the driver's characteristics, etc. Stop intersections have a positive relationship with the aggressive driving style, which correlates to potentially risky intersections. When preparing the route plan, signalized intersections should primarily be considered to avoid potential dangers from an aggressive driving style. The phase plan and the structure of signalized intersections should also be well researched to prevent truck drivers from aggressive driving and avoiding a long waiting time. This paper also has some limitations. The limitations of the research are as follow:  
1. The sample size of the study is relatively small. 2. A single research method was used, and the comparison of different methods should be conducted. 3.