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Collision Diagrams On GIS Map Module (Item# A-12)

 

Figure 12A: Plotting Collision diagrams On GIS Map In 3 Dimensions
 
Features:
It plots collision diagrams directly on a GIS map. Each symbol denotes a crash. Circles denote intersection crashes. Squares denote mid-block crashes. Colors denote collision types. Inside each symbol, there are 2 arrows, representing the travel directions and turning movements of 2 involved vehicles and/or pedestrians. If one of the involved vehicles was going north, for instance, then one of the arrows inside the symbol will be pointing north (a "?" represents missing data). If the crashes are at the same location, the symbols will be stacked on top of one another, creating a 3 dimensional view. Because of 3-D viewing, you can visualize high accident locations from the symbols' heights, as well as the dominant collision types from the symbols' colors. You can zoom-in to see the arrows inside each plotted symbol; hence you can determine the collision type, travel directions and turning movements of each collision. It is useful for both regional and localized traffic safety analyses.    
·   You can plot collision diagrams for one location, or for hundreds or thousands of locations.
·   To plot them, you can select locations from the map by drawing one or more areas of any shapes; or you can select locations by querying any fields in your data.
·   After selecting the locations, you can click a button to plot them out. Figure 12A is a typical output.
·    You can: (It has the 3 dimension plotting features of the AIMS Main Module.)
  - Modify the plot with any combinations of size, color, angle, and height factor of symbols to produce almost unlimited number of plots (Figures 12B to 12D).
  - Label each symbol with information from 1 to 10 fields in your data (Figure 12E).
  - Click a symbol to display the scanned accident report image (Figure 12F).
  - Plot the collision diagrams on roadway layout (Figure 12G).
  - Plot the collision diagrams on aerial photograph (Figure 12H).

 

 
Figure 12B: Same As Figure 12A, Except Plotting With A Different Symbol Stack Angle
(You can modify any plot with a symbol stack angle of 0 to 360 degrees. Figure 12A uses 120 degrees. Figure 12B uses 60 degrees. 0 degree is horizontal to the right. 90 degree is vertically up. Plotting in different angles will avoid some locations being blocked.)
 
 
Figure 12C: Zoom-Out View of Figure 12A, Plotting With Smaller Symbol Size And Height Factor
(By zooming-out and plotting with a smaller symbol size and height factor, you can view the whole study area. You can visualize the high accident locations from the height of stacked symbols. You can visualize the dominant collision types from the symbol colors. It is useful for area-wide analysis.)
 
 
Figure 12D: Zoom-In View of Figure 12A, Plotting With Bigger Symbol Size and Height Factor
(By zooming-in and plotting with bigger symbol size and height factor, you can see the arrows inside symbol clearly. Hence you know the collision type, travel directions and turning movements of each crash at each location. It is useful for analyzing individual locations, such as the interchange area around location A.)
 
 
Figure 12E: Labeling Each Symbol With Year and Number of Injuries
(You can label each symbol with information from 1 to 10 fields in your data. You can choose size, color and style of font. You can create expressions to make the label meaningful. For example, when labeling year and number of injuries, the expression <"Yr=" + YearField + ",Inj#=" + InjuryField> will insert the word "Yr=" before each year information, and so on as shown above. Note: You can modify the plot with different angle, height and size of symbols if some labels are blocked.)
 

 
Figure 12F: Plotting Collision Diagrams On Roadway Layout
(If you have the Collision Diagram Roadway Layout Module, you can add roadway layout in the background. You can turn the roadway layout on or off at any time.)
 
 
Figure 12G: Displaying Scanned Accident Report Image When Clicking A Plotted Symbol
(If you have the Accident Report Image Module, you can click a symbol to display the scanned image of the original accident report associated with the crash. It will be convenience to get detail information and to verify the accuracy of the plotted symbol.)
 
 
Figure 12H: Plotting Collision Diagrams On Aerial Photograph
(If you have the Aerial Photograph Module, you can plot the collision diagrams on top of aerial photograph. You can turn the photograph on or off at any time. In addition, you can add the roadway layout, on or off at any time, if you have the Collision Diagram Roadway Layout Module. This will be useful to relate crash occurrence to surrounding environments.)
 

Note:

Differences between plotting collision types in 3 dimensions and plotting collision diagrams in 3 dimensions:

- Plotting collision types in 3 dimensions (Main Module, Item A-01): The arrows inside each symbol are fixed. The arrows reflect the collision types only. 
- Plotting collision diagrams in 3 dimensions (Collision Diagrams On GIS Map Module, Item A-12)): The arrows inside each symbols are plotted according to the travel directions and turning movements of each accident record. The arrows reflect the travel directions, turning movements and collision types. (If information is missing, or if the collision type and travel directions are in conflict, a “?” sign is used.)
 
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