Re: [sumo-user] Sumo Vs meso

[rony gracious <rony.grcs@xxxxxxxxx>]

Would increasing the amber time between the green phases have the same effect?
What do you mean by switching? I was optimizing changing the stage times after every simulation.

On Thu, Jun 20, 2019 at 1:17 PM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:

Meso vehicles do not suffer from start-up delays the way micro vehicles do.

To model the cost of switching, Modify, the traffic cycle so that are all-red phases of sufficient length when switching between the green phases.

This way, shorter cycle times will definitely reduce capacity.

Am Do., 20. Juni 2019 um 07:02 Uhr schrieb rony gracious <rony.grcs@xxxxxxxxx>:

Why does when i calculate average delay at any junction in meso its always lower the cycle time lower the delay? If thats the case there is no way i can optimize using meso?

On Wed, May 29, 2019 at 5:52 PM rony gracious <rony.grcs@xxxxxxxxx> wrote:

Thanks. I will check this out.

On Wed, May 29, 2019 at 5:39 PM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:

In meso, vehhicles don't have to lane-change in order to use the correct turning lane. In the sumo microsimulation, lanechanging does play a role and and can impede traffic. You can check whether it makes a difference if you set vehicle attribute departLane="best" so vehicles enter the simulation already on the correct lane.

Also, meso vehicles depart with maximum speed. To get the same effect in sumo set departSpeed="max".

Am Mi., 29. Mai 2019 um 14:04 Uhr schrieb rony gracious <rony.grcs@xxxxxxxxx>:

2 two lane edges towards the junction and two three lane ones. 

Vehicle count is around 20 - 60k in different approaches. 

On Wed, 29 May 2019, 5:31 pm Jakob Erdmann, <namdre.sumo@xxxxxxxxx> wrote:

It may help to observe both simulations closely in sumo-gui to see if there is an obvious difference in behavior indicating a problem in either of the simulations.

How large is your scenario in terms of intersections,edges,vehicle count?

Am Mi., 29. Mai 2019 um 10:55 Uhr schrieb rony gracious <rony.grcs@xxxxxxxxx>:

The flow given was same for both 5 hour simulation. But when I take count for every 30 minutes that's where the difference is. The last vehicle in sumo enters 2 hours after the last vehicle in meso entered. 

Yes. Sorry. I meant junction control. 

On Wed, 29 May 2019, 12:30 pm Jakob Erdmann, <namdre.sumo@xxxxxxxxx> wrote:

It's hard to answer this generally. Meso and miro are different models so there will be many situations in which they produce different results.

You first have to figure out whether the sumo flow is too low (e.g. due to road nework problems) or whether the the meso flow is too high (which can be due to the used options).

There is no meso option called tl-logic (but there is one for tls and one for junction control) so you need to be more precise on the used option.

regards,

Jakob

Am Mi., 29. Mai 2019 um 07:47 Uhr schrieb rony gracious <rony.grcs@xxxxxxxxx>:

For the same flow sumo is taking around 2 hours of extra simulated time then meso which accounts for this extra counts.

On Wed, May 29, 2019 at 11:02 AM rony gracious <rony.grcs@xxxxxxxxx> wrote:

While I run meso for a 5 hour simulation with loop detectors placed there is a considerable difference in vehicle count from when I do the same with sumo. When I took vehicle count every 30 minutes meso had atleast 100 vehicles more than sumo in each time step of 30 minutes. 

Can anyone tell me why that is and how I can get more closer to a sumo SIM with meso. The only parameters I am using is mesosim true and meso tl logic true which is in mesoscopic. 

Rony Gracious

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