## 5 Results  
### Result of the Transportation Integration Index  
According to the relevant statistical data, the structure index, function index, and transportation integration index of the transportation network in the Yangtze River Delta were obtained through calculation, which can directly reflect the development level of the transportation integration of the Yangtze River Delta.  
According to the Table 2, the transportation network structure index of the Yangtze River Delta urban agglomeration in 2020 was 0.5723, an increase of 8.16% compared with 2011. On the whole, the transportation network structure index of Yangtze River Delta urban agglomeration showed an upward trend from 2011 to 2020. In 2019 and 2020, the transportation network function index of Yangtze River Delta urban agglomeration was 0.3958 and 0.3742, respectively, which decreased by 5.45% in 2020 compared with 2019. On the whole, the transportation network function index of the Yangtze River Delta urban agglomeration showed a certain upward trend from 2011 to 2020.  
In 2019 and 2020, the transportation integration index of the Yangtze River Delta urban agglomeration was 0.5871 and 0.5772, respectively, increasing by 4.17% and 2.14% compared with 2011, respectively. Due to the impact of COVID-19, passenger and cargo  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Year** & **Transportation Structure Index** & **Transportation Function Index** & **Transportation Integration Index** \\ \hline
2011 & 0.5291 & 0.3780 & 0.5636 \\
2012 & 0.5291 & 0.3871 & 0.5682 \\
2013 & 0.5291 & 0.3946 & 0.5720 \\
2014 & 0.5291 & 0.3895 & 0.5694 \\
2015 & 0.5311 & 0.3801 & 0.5695 \\
2016 & 0.5434 & 0.3762 & 0.5707 \\
2017 & 0.5492 & 0.3993 & 0.5866 \\
2018 & 0.5549 & 0.3900 & 0.5823 \\
2019 & 0.5608 & 0.3958 & 0.5871 \\
2020 & 0.5723 & 0.3742 & 0.5772 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Calculation results of transportation integration index in Yangtze River Delta Urban agglomeration (2011–2020).  
transportation in the Yangtze River Delta urban agglomeration in 2020 was impacted to a certain extent, but overall, the transportation integration index of the Yangtze River Delta urban agglomeration from 2011 to 2020 showed a certain upward trend.  
According to the Table 3, Shanghai, Nanjing, Hangzhou, Xuzhou, Jiaxing, and Hefei were the top six cities in terms of transportation network structure index of Yangtze River Delta urban agglomeration in 2020. In 2020, Quzhou, Maanshan, Suqian, Yancheng, and Zhoushan ranked the lowest five cities in the transportation network structure index of Yangtze River Delta urban agglomeration.  
In 2020, Shanghai, Suzhou, Hangzhou, Hefei, Ningbo, and Nanjing ranked the top six cities in the transportation network function index of Yangtze River Delta urban agglomeration, respectively. In 2020, Tongling, Huangshan, Lishui, Huaibei, and Zhoushan ranked the bottom five cities in the transportation network function index of Yangtze River Delta urban agglomeration, respectively.  
The spatial distributions of transportation integration index value of Yangtze River Delta urban agglomeration in 2020 are shown in Figure 3. The transportation integration index value of Yangtze River Delta urban agglomeration in 2020 ranked the top five cities, namely Shanghai, Hangzhou, Hefei, Suzhou, and Nanjing. The cities with the transportation integration index values in the Yangtze River Delta in 2020 were Huangshan, Huaibei, Yancheng, Suqian, and Zhoushan.