[mkgmap-dev] avg speed on roads

Wed Jun 2 22:57:54 BST 2010


On 02.06.2010 23:53, Carlos Dávila wrote:
> El 02/06/10 23:26, Felix Hartmann escribió:
>>
>> On 02.06.2010 03:41, maning sambale wrote:
>>> How much time penalty is added when the traffic_signal style below 
>>> is added:
>>>
>>> 2010/4/24 Florian Lohoff<f at zz.de>:
>>>
>>>>> certainly improve the arrival time estimation:
>>>>> highway=traffic_signals { add mkgmap:road-speed = '-2'; add
>>>>> mkgmap:road-speed-min = '1'
>>>>>
>>>
>>>
>> There is no time penalty. You simply decrease the speed/priority of the
>> next adjoining streets that touch the POI.
> That's right, of course, but at last speed decrease becomes an 
> increase in estimated arrival time.
Well it's a big difference. Imagine a very long street as one piece, 
only split by one traffic light. Here the mechanism will completely 
fail. On the other hand, it could also only change for a few meters, 
again fail. In general it works well though. Unluckily Garmin hasn't 
foreseen time penalties based on POI. (there exist realt time penalties, 
but only for turning WHEN changing the street...).