Re: [sumo-user] Fast Pedestrian Walks/Negative Time Loss

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

Hello,

the problematic behavior is caused by an invalid pedestrian route.

The edge sequence 633 -629 leads to junction 476 which is not connected with next route edge -813

This causes the person to walk contrary to the expected direction and thus reach the arrival position earlier than expected.

In the latest development version of SUMO additional warnings have been implemented to make the faulty behavior more obvious.

A possible fix would be to either use the sequence 633 -629 -629 -813 or 633 -813

The network itself is problematic insofer that it deviates from the two possible styles for pedestrian network modelling:

1) with crossings and walkingAreas. This makes it explicit where pedestrians may cross the road and is the recommended style for detailed pedestrian simulation (http://sumo.dlr.de/wiki/Simulation/Pedestrians#Building_a_network_for_pedestrian_simulation)

2) without crossing and walkingAreas but with sidewalks that have no connections. In this case, pedestrians will assume a fully connected topology at each intersection but their paths are not modelled (they "jump" across). This type of network is generated automatically by netconvert when not generating crossings or walkingareas. Note, that "jumping" potentially causes negative timeLoss in the current version but this will only be noticable if the dwadling option is disabled.

In your case the network contains sidewalks that are connected but this forces awkward detours because there are no connections that allow changing the walking direction.

regards,

Jakob

2018-07-25 15:15 GMT+02:00 Albiston, Gregory 2012 (PGR) <gregory.albiston2012@xxxxxxxxxxxx>:

Hello,

I have a scenario where there are numerous pedestrians undertaking walking stages.

Some of these stages are resulting in negative time losses meaning the pedestrian is arriving faster than the maximum speed.

All the vehicle stages have positive time losses.

Attached is an example scenario for one pedestrian which shows the issue. The first and final stages are completed with a time loss of -79.75 and -188.83. This equates to speeds of 1.84 and 2.41 when the max speed is set to 1.79.

Is there a modelling reason for the negative time losses?

Apologies if I've missed something.

Thanks,

Greg

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