# Evaluation of Different Work Zone Road-Occupation Schemes for Monorail Construction
## 4 VISSIM Simulation  
### Establishing the Model  
VISSIM (2022 student) is a microlevel simulation modeling tool based on time intervals and driving behavior used for traffic modeling of urban and public transportation operations. Therefore, this study uses VISSIM (2022 student) to simulate and evaluate solutions. Firstly, AutoCAD (2023) is used to draw existing actual solutions and two improved solutions, and they are imported into VISSIM (2022 student) as a base map. Secondly, to ensure the accuracy of the simulation model, the traffic parameters such as vehicle speed, traffic volume, geometric parameters (i.e., number of lanes, lane width, and workspace position), vehicle path, and traffic flow ratio in the model should be consistent with the actual situation and set one by one. In addition, to meet the actual traffic driving situation and conditions, conflict zones and signal control light phase parameters should also be set at intersections and east entrance roads.  
In order to study the impact of different occupation positions on traffic in the construction work zone of intersections, this paper considers three different construction occupation positions based on measured data: the innermost two lanes in the opposite direction, the innermost two lanes in the entrance road, and the innermost lanes in the entrance and exit roads. The traffic organization forms for the three schemes are shown in Figure 3. Figure 3a is the actual scheme used at the intersection, which occupies the innermost lane of the south entrance and exit while using the outermost auxiliary lane as a right-turn lane (Scheme 1). Figure 3b involves occupying the innermost two lanes of the south entrance while also occupying the opposite lane as a left-turn lane and the auxiliary lane as a right-turn lane (Scheme 2). Figure 3c involves occupying the two lanes from the south exit to the innermost side. To maintain lane balance, the left-turn lane of the entrance lane is used as the opposite straight lane (Scheme 3).  
\begin{table}
\begin{tabular}{c c c c c} \hline
**Direction** & **Steering** & **Car** & **Truck** & **Bus** \\ \hline \multirow{4}{*}{E1} & Straight & 297 & 4 & 8 \\  & Left & 78 & & \\  & Right & 45 & & \\  & Straight & 315 & 1 & 8 \\  & Left & 39 & & \\  & Right & 115 & & 1 \\  & Straight & 470 & 15 & 8 \\ W & Left & 112 & 1 & 6 \\  & Right & 57 & & \\  & Straight & 414 & 24 & 1 \\ S & Left & 63 & 1 & \\  & Right & 178 & 3 & 1 \\  & Straight & 280 & 20 & 6 \\ N & Left & 66 & 1 & 1 \\  & Right & 92 & 1 \\ \hline \end{tabular} E1 represents the motor lane of eastbound road; E2 represents the nonmaneuverable lane of eastbound road; W represents the westbound road; S represents the southbound road; N represents the northbound road.  
\end{table}
Table 1: Traffic volume statistics during one peak hour (7:30 a.m. to 8:30 a.m.) on 17 June 2023.  
VISSIM (2022 student) was used to simulate three road occupancy schemes. To achieve more precise simulation results, based on on-site investigations and suggestions from local  
Figure 3: Schematic diagram of three working zone road-occupation. (**a**) Scheme 1; (**b**) Scheme 2; (**c**) Scheme 3.  
transportation departments, some lane-changing parameters have been fixed to ensure that the simulated driving behavior aligns with that of Chinese drivers, as shown in Table 2: