jasonh300 wrote:If this was the case, you'd never get a jam anywhere in a dense downtown type area where the blocks are only 100 m. Or maybe my idea of 100m is distorted.
How big is a city block?
100 meters is about average.
Yep, that's part of the issue with this type of filter. Valid traffic information is filtered out to try to deal with Wazers who are running the application when they are not driving with the flow of traffic.
I don't know if you ever noticed, but nearly everytime I run into a traffic jam on a freeway, the speed that Waze has posted seems to be a bit higher than the speed that the traffic is actually moving. Very difficult to eyeball it though. Could be that the 50 meters of data that is discarded is falsely inflating the traffic speed in every segment.
Think about base mapped segments that are loaded with extra, invalid junctions. Every segment between junctions could be discarding valid speed/traffic data.
Disclaimer - The actual algorithms that Waze is using have not been fully disclosed by Waze and/or may have changed.