Transportation Systems Simulation - A Tutorial for Multi-Modal Simulation Using VISSIM/Pedestrian: Traffic Data Input
To make the model a complete simulation the volume, types, and routes of pedestrians need to be defined over the physical model area. This simulation has a single origin and destination that represent the pedestrians generated from the southwest parking lot. The 5-minute interval volumes coming from this parking lot can be found on the ped tab in the shoppesdata.xlsx file. Surveys and traffic studies determined that most shoppers generated from this area go to one large store, one small store, and one medium store, then return to the parking area or continue shopping. Three procedures must be done to accomplish this; Define Pedestrian Compositions, Define Pedestrian Inputs, and Define Pedestrian Routes.
Define Pedestrian Compositions
- The file shoppesdata.xlsx contains the pedestrian compositions found for this site.
- Go to Traffic > Pedestrian Compositions to show the list.
- Then Right Click in the list and Click add (see Figure below).
- Name the new pedestrian composition “Shoppes”.
- Make sure Pedestrian Composition Relative Flows is selected in the dropdown menu to show the second list.
- Right Click to add the four different pedestrian types with attributes as given in shoppesdata.xlsx in the tab pedcomp.
Define Pedestrian Inputs
- Click on Pedestrian Inputs network object (see Figure below).
- Then Right Click on the pedestrian area to add the input to the area. The list will appear below.
- Choose Pedestrian volumes by time interval to be the second list.
- Right Click in the second list window and click Add. Add 24 time intervals each 300 seconds until 7200 seconds.
- A quick way is to Right Click, then press A, and repeat swiftly 24 times.
- Copy and paste the time interval volumes from the ped tab in the file shoppesdata.xlsx.
Define Pedestrian Routes
- Click on pedestrian routes (see Figure below)
- Then Right Click in the area the route starts and Click in the ending area.
- To add additional destinations for the same origin, continue clicking in destination areas.
- Automatically the relative flows will be 1.0, meaning that the routes are split evenly between each area.
- For the final route, from the large store to parking or small stores, the even split needs to be revised as shown in the figure below to have 70 people go to parking and four people who go to each small store.
- When the pedestrian is initially assigned a route, when it reaches its destination it will recalculate its route based on the new origin and routing decision of the new area.
- Repeat this process for all the routes shown below.