# Evaluation of Adjustment Effects of Highway Guide Signs Based on the TOPSIS Method
## 3 Survey Plan
### Analysis of Questionnaire Data  
Topic 1: Importance of guide signs  
In the survey, team members asked respondents: \"Which guidance tools do you rely on while driving? (Please rank them in order of importance)\". Drivers ranked the options based on their experience, and the sequence was assigned values of 1, 2, 3, and 4, with lower values indicating higher priority. The average value for each option was then calculated to assess its overall importance. The lower the average value, the more important the option was perceived to be. The statistical results are shown in Table 1 (N represents the number of respondents who selected each item). Vehicle navigation systems emerged as the most critical tool, followed by guide signs, maps, and asking locals. Notably, while vehicle navigation is frequently relied upon, 78% of drivers stated they trust road signs more when discrepancies arise, indicating that standardized road signs remain a trusted source of information. This suggests a need for enhanced precision in navigation systems to complement the consistency of road signs.  
Topic 2: Overall evaluation and main issues of guide signs  
In this survey, a statistical analysis of the question, \"Have you ever taken a wrong turn due to guide signs?\" revealed that approximately one-third of respondents admitted taking wrong turns due to guide signs, indicating a need for improvement in their accuracy and reliability. Additionally, a statistical analysis of the question, \"What do you think are the main problems with highway guide signs?\", as shown in Table 2 (see Appendix A), highlighted the main issues identified by the respondents. The main issues identified, ranked by importance, included missing useful information, poor visibility, complicated graphics, information overload, inconvenient placement, and signs being blocked by trees. These problems highlight challenges such as difficulty in finding essential details, insufficient visibility, and complex designs that hinder quick interpretation, particularly under time constraints. Addressing these issues through clearer, more visible, and user-friendly signage is essential to enhance safety and driving efficiency.  
Topic 3: Driver-focused guidance information  
To conduct an in-depth study on the issue of \"unable to find useful information\" reported by drivers, we further inquired about which information drivers primarily focus on in highway signs. The statistical analysis results for the survey question \"Which information do you mainly use from highway signs (multiple choice)?\" are presented in Table 3 (see Appendix A).  
The survey revealed that the most critical guidance information for drivers includes \"names of reachable destinations\" (75.0%), \"names of reachable highways\" (62.3%), and \"current highway name\" (27.1%). For unfamiliar destinations, drivers prioritize information about \"highways along the route\", followed by \"traffic hubs and interchanges\" and \"towns along the route\". While drivers are generally satisfied with highway signs, issues such as the inability to find useful information, unclear signage, and complex graphics remain. These findings emphasize the importance of clear, accessible, and relevant information on  
\begin{table}
\begin{tabular}{c c} \hline
**Main Issues** & **Quantity** \\ \hline Sign information and text height do not meet requirements & 48 \\ \hline Sign layout design does not comply with national standards & 44 \\ \hline Improper sign placement & 4 \\ \hline Inconsistent sign information & 10 \\ \hline Information overload on the sign layout & 8 \\ \hline \end{tabular}
\end{table}
Table 5: Statistics of issues in highway direction sign settings.  
guide signs to enhance navigation and reduce errors. Further field research is planned to address these concerns.