## 4 Result
### Obstacle Recognition Distance by Color Temperature of Road Lighting  
A paired-samples t-test was conducted to verify whether there was a significant difference in the obstacle recognition distance by color temperature of road lighting in the same weather and same road lighting class. The results are shown in Table 7.  
As a result, it was found that there was no difference in obstacle recognition distance between 4940 K lighting (white light) and 3006 K lighting (yellow light) under normal conditions. On the other hand, in the fog, there was a significant difference in M1 (t = \(-\)3.826, \(p\) < 0.001), M3 (t = \(-\)12.360, \(p\) < 0.001), and M5 (t = \(-\)6.75, \(p\) < 0.001). Likewise, in the rain, there was a significant difference in M1 (t= \(-\)6.885, \(p\) < 0.001), M3 (t = \(-\)5.867, \(p\) < 0.001), and M5 (t = \(-\)3.943, \(p\) < 0.001). For comparison of obstacle recognition distances by color temperature in groups with significant differences in obstacle recognition distances, when the 3006 K is set to 100%, the ratio of 4940 K is as shown in Table 8. \begin{table}
\begin{tabular}{c c c c c c c} \hline \multicolumn{2}{c}{**Classification**} & \multicolumn{4}{c}{**Obstacle Recognition Distance Ratio Compared to Normal**} \\ \hline
**Color Temperature** & \multicolumn{2}{c}{**4940 K**} & \multicolumn{2}{c}{**3006 K**} \\ \hline
**Weather** & **Normal** & **Fog** & **Rain** & **Normal** & **Fog** & **Rain** \\ \hline \multirow{3}{*}{Lighting classes} & M1 & 100.00\% & 30.59\% & 54.75\% & 100.00\% & 32.70\% & 59.77\% \\  & M3 & 100.00\% & 27.14\% & 56.18\% & 100.00\% & 35.81\% & 62.45\% \\ \cline{1-1}  & M5 & 100.00\% & 29.97\% & 59.79\% & 100.00\% & 36.08\% & 65.30\% \\ \hline \end{tabular}
\end{table} 
Table 6: Obstacle recognition distance ratio compared to normal. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \multicolumn{2}{c}{**Dependent Variable**} & \multicolumn{2}{c}{**Explanatory Variable**} & \(n\) & **Mean** & **SD** & **F** & \(P\) &
\begin{tabular}{c} **Post Hoc** \\ **(Tukey HSD)** \\ \end{tabular} \\ \hline \multirow{4}{*}{Obstacle recognition distance (4940 K)} & \multirow{2}{*}{M1} & Normal (a) & 60 & 63.07 & 16.61 & & & \\  & & Fog (b) & 60 & 19.29 & 2.95 & 266.193 & \(<\)0.001 & b \(<\) c \(<\) a \\  & & Rain (c) & 60 & 34.53 & 7.03 & & & \\ \cline{2-8}  & & Normal (a) & 60 & 55.89 & 15.16 & & & \\  & & Fog (b) & 60 & 15.17 & 3.61 & 278.712 & \(<\)0.001 & b \(<\) c \(<\) a \\  & & Rain (c) & 60 & 31.4 & 5.34 & & & \\ \cline{2-8}  & & Normal (a) & 60 & 50.29 & 12.97 & & & \\  & & Fog (b) & 60 & 15.07 & 2.79 & 279.312 & \(<\)0.001 & b \(<\) c \(<\) a \\  & & Rain (c) & 60 & 30.07 & 5.04 & & & \\ \hline \multirow{4}{*}{Obstacle recognition distance (4940 K)} & \multirow{2}{*}{M3} & Normal (a) & 60 & 63.08 & 16.37 & & & \\  & & Fog (b) & 60 & 20.63 & 3.39 & 250.252 & \(<\)0.001 & b \(<\) c \(<\) a \\  & & Rain (c) & 60 & 37.7 & 6.98 & & & \\ \cline{1-1} \cline{2-8}  & & Normal (a) & 60 & 54.12 & 15.08 & & & \\ \cline{1-1}  & & Fog (b) & 60 & 19.38 & 3.36 & 199.725 & \(<\)0.001 & b \(<\) c \(<\) a \\ \cline{1-1}  & & Rain (c) & 60 & 33.8 & 5.99 & & & \\ \cline{1-1} \cline{2-8}  & & Normal (a) & 60 & 48.73 & 14.69 & & & \\ \cline{1-1}  & & Fog (b) & 60 & 17.58 & 4.09 & 163.672 & \(<\)0.001 & b \(<\) c \(<\) a \\ \cline{1-1}  & & Rain (c) & 60 & 31.82 & 5.93 & & & \\ \hline \end{tabular}
\end{table} 
Table 5: Significance of difference in obstacle recognition distance by weather. As a result of the analysis, the difference in the color temperature of road lighting is not significant under normal weather conditions, but in rain and fog situations there is a significant difference in obstacle recognition distance between 3006 K (yellow light) and 4940 K (white light), and it was found that the obstacle recognition distance was longer than that of 4940 K lighting.