Re: [sumo-devel] MeanSpeed of a Lane

[Ashutosh B. <ash...@ii...>]

Hi daniel,

Yes, I was little bit sure about the fact depends on usage. Any way your
usage creates requirement for the same but i wanted to ask about the
meanspeed which is defined by the average speed of a vehicle.

In one case: I need average speed of a vehicle for an interval on that
lane but it also add up the lanes maximum speed which does not logically
sound.

The other usage is signal control algorithms. In which we need to find out
the offset for getting synchronization among junctions and offset is
depend upon the average travel time of the vehicle that can be found by
average speed. but with the current function it is not accurate.

Yes, there is other option to get the average speed from traci by sum up
the speeds of all vehicles and get the average but the alternative can be
better if that function exist.



> Hello Ashutosh,
>
> well, it's a definition thing. I mean, the major usage of getting mean
> speed was to determine the average velocity of vehicles for routing. For
> this use case, if no other vehicle blocks the street, the vehicle to be
> routed can be assumed to drive as fast as it's allowed on the lane. That's
> why maxSpeed is returned.
> What is the use case you need the value for?
>
> sincerely,
> Daniel
>
> 2011/11/16 Ashutosh Bajpai <ash...@ii...>
>
>>
>> Hi Daniel,
>>
>> In the getMeanSpeed function of lane class, there might be a little
>> confusion but what it looks like, it does not need to return laneś max
>> speed when there is no vehicle in that lane. It should return 0.
>>
>> SUMOReal
>> MSLane::getMeanSpeed() const throw() {
>>    if (myVehicles.size()==0) {
>>        return myMaxSpeed;
>>    }
>>
>>
>>
>> --
>> Thanks and Regards
>>
>> Ashutosh Bajpai
>> Research Associate
>> Dept. of civil engineering
>> IIT Mumbai
>>
>>
>>
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>


-- 
Thanks and Regards

Ashutosh Bajpai
Research Associate
Dept. of civil engineering
IIT Mumbai