Indicate both start and end of roadworks / traffic
For users that mark the beginning or roadworks / traffic, leave up an icon that they can press to indicate the end of the traffic. From this, work out how long it took me to get through the zone and pass on the info to other users.

Thanks for your feedback. At this time, this doesn't fit on our roadmap, but we'll keep it in mind for future product planning.
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Ride and save 131 commented
I'd like to share a feature idea: allowing users to input a specific start and end point to view real-time traffic conditions, even if they're not currently located at the starting point, similar to Google Maps. This functionality would greatly enhance trip planning capabilities and provide valuable insights into traffic conditions before embarking on a journey.
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Hans van Dongen commented
I report roadworks. But they disappeared from Waze a few days later. But sometimes work takes longer. Then I report it again! Is it an option to continue this work at home if it is known how long this will take. So not while driving. I pass a point where this lasts until the end of 2019 every time after a few days I have to report it again.