Expire events option
Give a general or category specific option to delete/expire events. e.g. most crashes/accidents are cleared in 30 minutes or less, yet the event lingers in Waze for 2 hours or more. So let the user chose how old an event will be displayed.
Move your votes over there, because this is an important one!
Better idea would be to shorten predefined validity time to 2 hours but let user to changethe validity time from predefined 2 hours to more or less at recording new event. Please look at "Shorten traffic warnings validity time"