# Move Over Law Compliance Analysis Utilizing a Deep Learning Computer Vision Approach
## 4 Results
### Advance Warning Sign  
Figure 2 illustrates the compliance rate distribution for incident scenes when an advance warning sign (i.e., a flashing arrow sign) exists versus those cases where there was no warning sign at the scene. Additionally, this figure shows the count distribution of the incident scene based on the existence of the advance warning sign category and presents the \(p\)-value of comparing the two categories' compliance rate mean values using the t-test. According to this figure, the mean compliance rate is 9.6% higher when there is an advance warning sign at the incident scene. This difference is statistically significant, with a probability of 83.36%.  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Metric** & **Value** \\ \hline No. of scenes & 68 \\ No. of tracked vehicles & 33,118 \\ No. of vehicles subject to the Move Over & 7871 \\ law & \\ Compliance rates (averaged by scenes): & \\ Mean & 47.8\% \\ Std. dev. & 26.7\% \\ Min. & 5.4\% \\
1 st quartile & 24.9\% \\ Median & 42.5\% \\
3 rd quartile & 64.9\% \\ Max. & 100\% \\ \hline \hline \end{tabular}
\end{table}
Table 4: The summary of the results of Move Over law compliance analysis. Of 7871 vehicles that were subjected to Move Over law, the average compliance rate for the scenario was less than 50 %, and while there existed a scenario with 100 % compliance rate, the very low minimum (5.4 %) and the high standard deviation value show that the actual compliance rate varies significantly from scenario to scenario.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Variables** & **Categories** & **Definition** \\ \hline Advance warning sign & Exists & Whether a flashing arrow sign is present \\ Does not exist & at the scene \\ \hline \multirow{3}{*}{Responder vehicle type} & Police & \\ Safety Patrol & The type of responder vehicle at the \\ Both & & incident scene \\ \hline \multirow{3}{*}{Responder vehicle position} & Over the line & Whether the responder vehicle parks \\ \cline{1-1}  & On the shoulder & over the shoulder line or completely \\ \cline{1-1}  & On the shoulder & stays on the shoulder and does not \\ \cline{1-1}  & & occupy any portion of the next lane. \\ \hline Incident road type & Urban & \\ \cline{1-1}  & Rural & Incident location geographical area type \\ \hline \multirow{3}{*}{Occupied shoulder location} & Left & Whether the vehicles involved at the \\ \cline{1-1}  & Right & incident scene are parked on the left or \\ \cline{1-1}  & Passenger car & right shoulder \\ \hline Approaching Traffic vehicle type & Passenger car & \\ \cline{1-1}  & Truck & Type of approaching traffic vehicles \\ \hline Traffic volume & - & Flow rate of the approaching traffic \\ \hline \hline \end{tabular}
\end{table}
Table 3: List of the variables considered for Move Over law compliance rate analysis. The name of the variable (referenced in further analysis) is shown in column “Variables”. In the column “Definition”, we describe the actual description of what each variable represents. Then, in “Categories”, the possible values for each of the variables are presented.