MWB App should actively warn line workers of hazards

Currently the MWP allows a line worker to define a hazard on a map (i.e. tree down). The hazard is then displayed on the map for anyone else with the mobile app. The problem is that this is passive - others must go to the map to see the hazard on the map. The  proposal is to be able to actively warn other nearby line workers through the app in a more active way. So, for example, if a line worker declares a tree down on Elm Street, all line workers within some configurable distance (perhaps 1000 yards) are immediately notified of the hazard through the app, and any other line worker coming within that distance are also immediately notified, until the hazard is removed.