Re: [sumo-user] Segmentation fault when rear-end collision occur

[Maytheewat Aramrattana <maytheewat.aramrattana@xxxxx>]

Hello,

Thank you for your reply. I found out that the problem occurs when SUMO try to teleport vehicle, after a collision happens. I have tried the scenario on a newer version of SUMO, and the segmentation fault did not occur anymore (it seems version 0.29.0++ does not have this problem). However, I am wondering why it try to teleport the vehicle in the first place, because I have set the collision action to "remove" (or is this "remove" means teleport it beyond arrival edge?). This problem of trying to teleport instead of remove still persist in the newer version of SUMO.

Also, is it normal that after changing lane, the vehicle accelerate and crash into preceding vehicle? Is this a known problem with car-following models?

Best Regards,
Maytheewat Aramrattana

----- Original Message -----
From: "Jakob Erdmann" <namdre.sumo@xxxxxxxxxxxxxx>
To: "sumo-user" <sumo-user@xxxxxxxxxxx>
Sent: Wednesday, May 2, 2018 10:48:12 AM
Subject: Re: [sumo-user] Segmentation fault when rear-end collision occur

Hello, 
if you can test your scenario without PLEXE, please report whether the crash still occurs with SUMO version 0.32.0 
Otherwise, contact the author of PLEXE regarding usage of updated SUMO with PLEXE. 
regards, 
Jakob 


2018-05-01 13:14 GMT+02:00 Maytheewat Aramrattana < [ mailto:maytheewat.aramrattana@xxxxx | maytheewat.aramrattana@xxxxx ] > : 


Dear all, 

SUMO gives me segmentation fault (core dump) when the vehicle crashes in the simulation, is this a normal expected behaviour from SUMO? Actually, I am not even sure why the crash happens. I am using SUMO version 0.26.0 that is a part of PLEXE. I am using the following specification for all vehicles: 

<vType id="vtypehuman" accel="2.5" decel="6.0" sigma="0.3" tau="1.0" length="4" minGap="2" lcLookaheadLeft="10.00" maxSpeed="33.33" carFollowModel="Krauss" color="0,1,1" probability="1" laneChangeModel="JE2013"></vType> 

This is part of my configuration file: 
<time> 
<begin value="0"/> 
<end value="86400"/> 
<step-length value="0.01"/> 
</time> 

<processing> 
<collision action="remove"/> 
</processing> 

My scenario is that there are a flow of vehicles on the highway and another flow coming from "on-ramp", then they are suppose to merge and continue on the highway. I will try to illustrate the road below. The problem is, at some point, when a vehicle from the on-ramp, merge into the main road, after the lane change, it just accelerate and crash into its preceding vehicle. Then, the simulation crash with segmentation fault. 

---------------driving direction-------------------->>>> 

---------------------------------------------- 
---------------------------------------------- 
-------------- -------------- ,-------------- 
/ ,--------------/ 
/ / 
/ / 

Although it did not crash when I use IDM, the IDM gave unwanted behaviour, i.e. it sometimes stop (or slow down significantly) after it perform the lane change. 

Please advise. 

Best Regards, 
Maytheewat Aramrattana 
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