Hi Jakob, all, We have investigated in detail and I think that we have found the small bug.
If we watch carefully the video starting from 0:40. We see that there is a vehicle generated in lane 2 of west side of the intersection. The reason that the vehicle is generated here is in log as follows: Warning: Invalid departPos 101.36 given for vehicle 'h12829c1:1'. Inserting at lane end instead. The vehicle generated is slightly "in" the intersection, thus the vehicle from upper side is blocked unfortunately. Because he thinks that the vehicle from west has already entered the intersection, should let it pass first. The problem is amplified as we have implemented an algorithm that favors the phase in which the queue is the longest. As the upper side queue is the longest, they always get green, while actually the upper side is always waiting for the west side vehicle to go, It creates a dead lock until teleportation of the west side vehicle. A simplest solution can be enforce the depart position at the beginning of lane rather than the end. To avoid completely the situation maybe we should modify a little bit the priority rule within the intersection. Best, Jun On Mon, Apr 7, 2014 at 1:07 PM, Xiangjun Qian <[email protected]>wrote: > Hi, > > Thank you very much for your feedback. > > I'm using sumo.0.19.0 for now. I tested with 0.20.0 and it still occurs. > > I investigate a little more and find that with fixed cycle fixed time > traffic light, it seems to be OK. > > However we are testing an algorithm to update traffic light time and even > cycle online. And it is here that the problem occurs > > Please find in the attachement the net-file and route-file in google > driver, it's big. > > > https://drive.google.com/file/d/0B0RFzBhW5MOUVUFDa2VrbGpYRHc/edit?usp=sharing > > https://drive.google.com/file/d/0B0RFzBhW5MOUZ2NBenNuRmhZdlE/edit?usp=sharing > > https://drive.google.com/file/d/0B0RFzBhW5MOUeE4wNm1fa0NoSXc/edit?usp=sharing > Tks again. > > Best > > > On Mon, Apr 7, 2014 at 11:31 AM, Jakob Erdmann <[email protected] > > wrote: > >> Hello, >> - which version of sumo are you using? Version, older than the latest >> release are known to contain bugs where vehicles sometimes block the >> intersection. If you are using an older version please upgrade and check >> whether your problem goes away. >> - if you are using the latest version of sumo, I would like to take a >> look at your input files. The u-turning vehicle at video second 43 is >> indeed blocked for no apparent reason. >> regards, >> Jakob >> >> >> 2014-04-07 10:57 GMT+02:00 Xiangjun Qian <[email protected]>: >> >>> Hi all, >>> >>> I've been working on SUMO to simulate impacts of traffic light algorithms >>> on network output, while I have observed a abnormal phenomena. A vehicle >>> is half entered in the intersection and all other vehicles are somehow >>> stopped before the traffic light, even the light is green. This phenomena >>> may persist for a quite long time that greatly impacts the simulation. >>> >>> To better illustrate the phenomena, a video is provided in Youtube here >>> https://www.youtube.com/watch?v=NOuLYPseqYY&feature=youtu.be >>> >>> See the vehicle on the north left and u turn lane at the beginning and at >>> time =0:39 >>> >>> This phenomena is usually happened on vehicles performing U turns, but >>> not >>> all vehicles perform U turn will cause this problem... >>> >>> Would you have any clue on this problem? >>> >>> Thank you very much for your feedback. >>> >>> Best >>> >>> -- >>> Xiangjun >>> >>> ------------------------------------------------------------------------------ >>> Put Bad Developers to Shame >>> Dominate Development with Jenkins Continuous Integration >>> Continuously Automate Build, Test & Deployment >>> Start a new project now. Try Jenkins in the cloud. >>> http://p.sf.net/sfu/13600_Cloudbees_APR >>> _______________________________________________ >>> sumo-user mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/sumo-user >>> >> >> > > > -- > Xiangjun > -- Xiangjun ------------------------------------------------------------------------------ Put Bad Developers to Shame Dominate Development with Jenkins Continuous Integration Continuously Automate Build, Test & Deployment Start a new project now. Try Jenkins in the cloud. http://p.sf.net/sfu/13600_Cloudbees_APR _______________________________________________ sumo-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/sumo-user
