dmcconachie wrote:As to guessing the speed limit, that's just completely unworkable. These data are useless unless fairly accurate.
I agree that it's not my preferred method of collecting speed limit data (getting the data straight from the government would be my preferred method!).
However, the 'guessing' method would of course need some nifty logarithms and logics in order to work.
First of all, the speed limits are of course 'rounded', in Norway (and probably EU/countries using Metrics) they are most commonly 50kph (populated areas), 80kph (sparsely populated areas) , 90/100/110kph (highways), with additions of 70/60kph on main roads that are considered high risk or when main roads momentarily enters/crosses populated areas, and 40/30 in residential areas.
My point is that Waze wouldn't only consider the average speed driven on a given stretch of road, but could/should also compare it to the nearest probable speed limit 'level' and could even take into consideration crossing roads (implicating a populated area, even a residential area if there are many crossing roads on a short stretch), maybe how the road looks (sharp turns, or straight runs for miles and miles?), and so on.
Also, Waze should not start guessing the speed limit before it has either a vast amount of 'probable' drives registered through the stretch of road, or a solid 'edit' in the Editor where someone with thrustworthyness has entered the actual speed limit, or it could add a feature asking through the app "is the speed limit here 70kph?" with a big YES button - where the driver is free to ignore the question and concentrate on driving and the question will go away after say 10 sec.
When Waze thinks it knows the speed limit on a road, it should probably not present it in the same graphical matter as an actual speed sign (black letters with red circle around) but find some other way/colors to underline that Waze doesn't /know/ the speed limit, it's just /guessing/ based on user data and feedback. It would still help me a lot.
But again - I would love to see the data coming straight from the source - the government.