Note: This article outlines the functionality of the “Advanced Network Screening” applications. To learn about regular Network Screening, see here.

The Advanced Network Screening applications are designed to help users rank and identify sites for further investigation and potential treatment along the roadway network based on predicted crashes calculated using Safety Performance Functions (SPFs) and other performance measures.

The Network Map displays the ranked segments, color-coded according to standard deviation. Green represents the lowest value, yellow represents the mean (+1 standard deviation), and red represents the second standard deviation (Mean + 2 standard deviations).

Users have more options in the Advanced Network Screening applications than regular Network Screening, including additional performance measures, more complex calculations, and the ability to add limiting values. The Advanced Network Screening applications have no limits on the number of segments/intersections/windows that can be analyzed in a screening. Some calculations in these applications take longer to complete, resulting in longer runtimes.

(A screening created in Advanced Network Screening - Segments, with the Network Map displaying the ranked segments in a specified county)

Learn what the Advanced Network Screening applications can do in the overview below:

When conducting a Network Screening, it is easy to see the dates of the historical crash data used to generate your screening results. Under Date Extents, you can see when the data was last calculated and stored.

To modify the dates, click the Date Extents and adjust the date range using one of the following options:

(The Date Extents in Advanced Network Screening - Segments)

(The Date Range box.)

Rank your selected roadway by the following Performance Measures:

Predictive performance measures require agency-specific SPFs to run the calculation. SPFs can be generated and managed through the Predictive Analysis application.

A comprehensive list of how the ranking criteria are calculated can be found in the Numetric Calculations Overview article. Click on the desired column to rerank the sites by that performance measure.

Columns can be ranked in ascending order, indicated by an up caret symbol (^) next to the column header, or in descending order, indicated by the down caret symbol (⌄). To switch from ascending and descending ranking order, simply click the column header again. Columns without the caret are displayed for informational purposes only and cannot be used for ranking.

(A screening with the selected segments ranked by number of crashes, with additional performance measures also displayed.)

Advanced Network Screening - Segments, Sliding Window, and Intersections will load up to the limit set by your organization (maximum of 2,500 sites) that meet your ranking and filter criteria. A more comprehensive list of all site rankings is available in the CSV download. The organizational limit is displayed in the lower right corner of the window.

Users can adjust the number of sites that appear in their screening by selecting the settings icon in the top-right corner of the screen. This opens the “Network Screening Configuration” pop-up menu, where users can adjust which sites rank in their screening.

(The settings icon in a non-saved screening)

(The settings icon in a saved screening)

(The Network Screening Configuration pop-up where users can adjust the sites to rank in their screening up to 2,500)

In Advanced Network Screening - Sliding Window, users can also adjust the window length from this pop-up. The Advanced Network Screening - Sliding Window configuration pop-up allows users to control the number of sites to rank and adjust the window length size between .1 and 10 miles

(The Advanced Network Screening - Sliding Window configuration pop-up)

Customize which columns appear in your screening using the "Hide/Show Columns" button at the bottom of the ranked site list. To export your sites as a CSV file, click the download button located to the right of the "Hide/Show Columns" button.

(The Hide/Show Columns and Download options at the bottom of the ranked sites list in Advanced Network Screening)

The filter bar can be used to generate custom Advanced Network Screenings. Use the available filters in your instance to generate roadway rankings and identify which roadways require your attention.

(An Advanced Network Screening - Segment Screening for a given city, including only non-interstate crashes, ranked by number of crashes.)

Organization admins can designate stored screenings as the default view, with pre-configured date ranges, filters, and other settings.

There are two types of filters available in Advanced Network Screening: Lightning filters and crash filters.

These filters include a lightning icon and are displayed in the filter bar by default. They provide instant results by filtering segments/windows/intersections from the existing dataset without requiring recalculation.

(Lightning filters in Advanced Network Screening - Segments)

(Lightning Filters in Advanced Network Screening - Sliding Window)

(Lightning Filters in Advanced Network Screening - Intersections)

Crash filters are hidden by default and can be accessed by selecting “Show All Filters” at the bottom of the “Select a Filter” window. These filters do not have a lightning icon and instead show “(Crashes)” next to them.

Crash filters take longer to load results. While lightning filters simply remove segments/windows/intersections from the existing dataset, crash filters remove individual crashes from a segment/window/intersection. This requires creating a new dataset and rerunning all calculations on it.

(Crash filters in Advanced Network Screening - Segments)

When Crash Filters are applied, a “Run Screening” pop-up notification appears, notifying users that using this filter will take longer to generate. Users can then select “Revert” or “Okay.” Selecting “Revert” will remove the applied crash filter. Clicking “Okay” will allow users to continue adding filters.

(The “Run Screening” pop-up window in Advanced Network Screening)

The map and ranking table will be grayed out while users add filters to finalize their screening. An estimated run time for the screening is displayed on this screen as well. Once all desired filters are applied, select “Save and Run” to run your screening.

(The edit screening page in Advanced Network Screening - Segments, as users continue adding filters before running the screening)

Once “Save and Run” is selected, the screening will begin generating. After this point, the filters cannot be edited. If needed, the screening can be canceled. Canceling allows users to add additional filters and re-generate the screening when ready. Users can safely leave the screening without impacting results. From here, users can also opt in to be notified via email when the screening is complete. Users can reopen any in-progress screening from their saved screenings at any time to view its completion percentage.

(The in-progress screening page in Advanced Network Screening)

Performance measures can be filtered to display only segments/windows/intersections that meet specific criteria. When applied, the ranking table and screening map will show only locations that satisfy the defined conditions. Users can define filtering criteria using comparison operators in the filter bar:

For example, to only rank segments with a crash rate of at least 1, use the “Crash Rate (Segments)” filter with the “greater than or equal to” operator and select a value close to 1.

Note: Users can only select values that exist in the current dataset. The system does not accept any numeric input. Users must choose from the actual values present in the segments/windows/intersections in your data. For example, if no segments have a crash rate exactly equal to 1.0, it cannot be entered as a filter value. Instead, users must select the closest available crash rate value that exists in the dataset (e.g., 0.98 or 1.2).

Clicking the Map Settings icon (the gear icon at the top of the map toolbar) lets you customize your map settings. The Zoom Controls settings are set as your global default map settings across all applications.

(The Map Settings section of Advanced Network Screening)

Zoom Controls

Auto-zoom automatically zooms the map to the crash extents as filters are applied or removed. Toggle this feature off to prevent the map from auto-zooming.

When toggled on, “Switch to Satellite” automatically switches the map view to satellite at a certain zoom level. Toggle this off to keep the map view consistent regardless of zoom view.

Polygon Settings

Enabling the polygon setting “Show name” and “Show area (square miles)” displays the name and square mileage of any applied polygons in your screening.

The Layer Settings allow users to toggle on or off available layers on the map, including boundaries (cities, counties, districts, etc.) and asset layers.

Use the map search to easily find locations. Note: Using the map search will not apply any filters to your screening.

Use the + and - zoom controls to easily zoom in and out of the map. Users can also use their mouse scroll to zoom in and out of the map.

Users can filter the map by drawing polygons to define geographic boundaries. To finish drawing a polygon, users must double-click the final point. Polygons can also be used to exclude the selected area from the screening. To exclude a polygon, select “inside” in the filter bar and change it to “outside.” Simply click a line of the polygon to adjust the shape.

Users can filter the map by applying circle filters to define geographic boundaries. Circles can also be used to exclude the selected area from the screening. To exclude a polygon, select “inside” in the filter bar and change it to “outside.” To adjust the radius of a circle filter, select the default “250 ft” in the filter bar and enter a new value for the radius.

When zoomed into a location on the map, users can use the Filter to View button to set a filter for the area currently displayed.

When zoomed in or out, users can use the Zoom to Extents button to return the map to display the current filter area (zooming in or out).

Download a .png file of the current map view in the screening, including any applied geo boundaries, circle/polygon filters, and displayed layers or assets.

Clicking on any location from the table or map to display the Location Flyout, which contains a summary of ranking and additional crash information.

(The Location Flyout in Advanced Network Screening - Segments)

Users can open a selected location in Safety Analysis, Predictive Analysis, or Crash Query, depending on their user permissions. To open a site in the selected application, click the “Open In” button in the Location Flyout and select the application from the list.

(The Advanced - Network Screening Location Flyout, with the available applications that the selected segment can be opened in.)

Advanced Network Screening supports three download options: Report (.pdf), Worksheet (.xlsx), and Geometry zip (.kmz). All of these download options are available under the Download icon in the top-right corner of the screen.

(The Downloads dropdown, displaying the three different download options.)

Generate downloadable Advanced - Network Screening Reports that include the network ranking and a breakdown of each location, including the crash rate, crash ratio, crashes per mile, fatality rate, and serious rate, and the distribution of crashes along the segment/window/intersection, grouped by severity.

(A sample Advanced - Network Screening Segment Report.)

The Worksheet download allows you to download the entire ranking table of all sites that meet your screening criteria as an Excel spreadsheet file, including all the columns of data included in your ranking table. Within the application, the table will only display the top 100 segments/windows/intersections; however, the downloaded Worksheet will include all locations that meet the filter criteria of your advanced network screening.

(The worksheet download for a given screening, including the additional columns of AADT, BMP, EMP, Functional Classification, Number of Lanes, and Length.)

The Geometry Zip download allows you to download a .kmz file containing the locations from your screening. Like the Worksheet Download, the Geometry download includes all segments/windows/intersections that meet your filter criteria, as well as all columns of data present in your ranking table. This .kmz file can then be loaded into any mapping application.

To save a screening, select the “Save” button in the top right corner of your screen.

Name your screening and indicate which category (or create a new one) to save it in. Saved screenings without assigned categories are saved to the "Uncategorized" category by default. New categories can be added from within the Save Network Screening pop-up menu.

(Pop-up menu to save a screening)

Once a screening has been saved, new menu options are available on the top right side of the screen within saved screenings.

The menu options from within a saved screening are:

To access your saved screenings, select the home button in the top-left corner of the Advanced Network Screening application.

(While in the Advanced Network Screening application, select the “Home” icon next to the applications menu)

This will take you to a page that displays screenings you’ve saved as well as screenings that have been shared with you.

(Saved screening page in Advanced Network Screening - Segments)

To share a screening, select the three dots next to a query from within the library. Select “Share” and then “Manage users” and enter the emails of the users you’d like to share the query with in the pop-up box.

(Click the three stacked dots next to a saved screening to share, edit the name/category, or delete it)

Indicate the level of access you want shared users to have to the screening: edit or view. Select "Done" when you’re finished. Sharing screenings can also be managed from within a saved screening using the “Share” icon in the top-right corner.

Screenings can only be shared with individuals who have access to that AASHTOWare Safety instance.