To access the black spot configuration, click the “System Settings” button at the top right of the Ashlar interface. Then set the severity threshold and click “Update”.
The black spot configuration consists of inputting a threshold for the percentile of locations to display. The percentile is relative to all road segments, and is represented as a decimal between 0 and 1.
Lower thresholds display more black spots; higher thresholds display only the most severe black spots. Updating the threshold does not have an immediate effect in DRIVER, but the update will be visible after the next scheduled run of the black spot calculation script.