# The Standardization Method and Application of the BIM Model for Interchanges
## 7 Conclusions  
This paper takes interchange as the object, and through the study of the existing related standards and literature, the following milestones of BIM model standardization methods and applications are obtained. 1. From the characteristics of BIM components and interchanges, this paper proposed the concept of standardization of BIM components for interchanges and discusses how the main contents of the standardization of BIM components for interchange should include the classification and coding of BIM components, the model depth classification of BIM components, and the creation of a BIM component library. 2. The principles and methods of classifying and coding BIM components for interchanges were determined, and the \"Classification and Coding Table for Interchange Specialized Components\" was developed. 3. The process of creating a BIM component library for an interchange should include five steps: overall planning, standard determination, component production, component library operation, and component library application. 4. This paper mainly studied the standardization of interchange BIM components at the theoretical level, produced some interchange BIM components, and initially established the framework of the interchange BIM component library. A complete interchange BIM component library has not yet been established but will be gradually improved by future studies. 5. The findings of this paper clarify the various tasks involved in carrying out the standardization of BIM components for interchange interchanges and open up new ideas for the standardization of BIM component processing. It also illustrates the feasibility of this standardization approach, using the construction of an interchange component library in China as an example, which can be replicated in the design of interchanges in various countries. A foundation is laid for the application of BIM technology to interchanges and the improvement of relevant BIM standard specifications. \begin{table}
\begin{tabular}{c c c c c} \hline
**Component Code** & **Component Name** & **Component Type** & **Component Location** & **Quantity** \\ \hline
18-08.01.03.00 & Ring ramp & \
\begin{tabular}{c} Interchange-specific \\ component ramp component \\ \end{tabular} &
\begin{tabular}{c} XX interchange \\ Ramp B \\ \end{tabular} & 1 pc \\ \hline
18-08.06.01.01 & Reduced speed lane & \
\begin{tabular}{c} Interchange special component \\ inversion nose-end &
\begin{tabular}{c} AK0+125/ \\ nose-end component & 2 pcs \\ \hline
18-03.01.02.00 & Asphalt concrete & \
\begin{tabular}{c} General component \\ pavement elements \\ \end{tabular} &
\begin{tabular}{c} Ramp A/Ramp B/ \\ Ramp C/Ramp D \\ \end{tabular} & 2520 m\({}^{3}\) \\ \hline
18-03.02.03.00 & \begin{tabular}{c} Graded gravel \\ subgrade \\ \end{tabular} & \
\begin{tabular}{c} General purpose component \\ pavement elements \\ \end{tabular} &
\begin{tabular}{c} Ramp A/Ramp B/ \\ Ramp C/Ramp D \\ \end{tabular} & 2520 m\({}^{3}\) \\ \hline
18-07.01.01.00 & Traffic markings & \
\begin{tabular}{c} General purpose traffic \\ engineering and \\ alignment components \\ \end{tabular} &
\begin{tabular}{c} Ramp A/Ramp B/ \\ Ramp C/Ramp D \\ \end{tabular} & 503 m\({}^{2}\) \\ \hline
18-07.01.03.00 & Guardrail & \
\begin{tabular}{c} General purpose traffic works \\ and facilities along the route \\ \end{tabular} &
\begin{tabular}{c} Ramp A/Ramp B/ \\ Ramp C/Ramp D \\ \end{tabular} & 717 m \\ \hline \end{tabular}
\end{table} 
Table 10: Quantities of interchange BIM components. **Author Contributions:** Conceptualization, Y.Z. and C.Z. ; methodology, B.W. ; software, X.W. ; formal analysis, Y.Z. ; writing--original draft preparation, Y.Z., C.Z. and B.W. ; writing--review and editing, C.Z. ; visualization, K.L. and Z.T. ; funding acquisition, C.Z. All authors have read and agreed to the published version of the manuscript. This research is part of the National Key Research and Development Program of China (2021 YFB2600103, 2020 YFC1512005, 2021 YFB2301602).