fotoroel wrote:I think its useless and to hard to implent, I like you idea, but its not going to work.
In the Netherland we have many and I mean many "drempels", that are little bumbs in the road that prevent people to drive to hard. Also it is very depending on how accurate the device is, some device have good accuration and some other thinks that you are falling 10KM without moving you hand.
Its also to hard to implent it, dev must do resource how the device shakes and what typ of road it is. What if you dont have a holder and you going hard right or you let it fall ? Phone flies away and waze makes a hazard or bad road condition.

Also if you cant drive that good or you have mechanical problems that the car shakes when you give gas? I think its just to complex to intergrate it into waze.
New car's have a system tat when you make a emergencybrake, the alarm light are going on, maybe waze can inplent this with making a 'car stopped', but also then you must avoid the phone is fly in your car or you let them drop.
Sorry for bad english
Sorry

but You could not be developer, because I read only pessimistic opinion.
What was made inside waze is way more difficult then solutions for road surface quality registration. It could be made differently. Lets'take logic and tools available.
- info about bumpiness or any shaking quality of road could be shared only after comparing several user crossings of same section of road. These indices must be compared and filtered out bounces which are not corresponding with most of cases. But if after share appears additional "shake" - user could be asked for explanation like "what was that?"
- waze must be able to detect device type, model, and using this info make these devices more or less trustable. After comparing graphs of shaking, different device models could be sorted by their sensitivity, and precision.
- also 2 different cases must be taken in account: constant shaking, like on country road, pavement, etc; and sudden or rare, permanent and short-term obstacles like holes, "drempels", grabage, transition between road surface materials, etc.
Off course solution is not too simple. Its some work with research, analyzing, testing. But it can be done and I think - quite easy for waze dev team. I am stil sure that this feature could be very useful, and even life saving, because some holes or drempels may be missed in fog or other conditions with limited visibility. And imagine how useful it could be for road provider or clerk to monitor problematic spots form REAL and actual data! Another gain form waze.