The trajectory is a piece-wise poly-line based on a cubic spline between the incoming and outgoing lanes, The number of line segments is set by the netconvert option --junctions.internal-link-detail (default 5).
2017-09-19 17:27 GMT+02:00 Do Duc Le <[email protected]>: > Hi Jakob, > > thank you very much. Can you tell me, how/with which formula the > x-y-position of each vehicle is computed (let's consider a cross > intersection where straight roads from north, west, south, east meet in the > middle)? For straight movement either x or y is incremented by the velocity > times timestep and the other variable stays the same, but how is it > actually done when the vehicle turns? Here both x and y changes. > > Best regards, > > Duc > > On 18.09.2017 21:29, Jakob Erdmann wrote: > > Hello, > by default, vehicles drive on so-called "internal edges" while passing an > intersection. They follow the car follow model just as on normal > edges/lanes. You can see these edges when you disable the option "draw > junction shape" in the gui visualisation settings. Only if you have built > your network with the option --no-internal-links will vehicles "jump" over > intersections. > regards, > Jakob > > 2017-09-18 13:40 GMT+02:00 Do Duc Le via sumo-user < > [email protected]>: > >> Hi, >> >> as the title says I'm interested in how the position of the vehicles are >> computed when turning at an intersection/junction. I know SUMO follows the >> car following model of Krauß and the position is computed as x(t + d t) = >> x(t) + v(t + d t)d for straight movement , which I also confirmed by the >> Traci function "traci.vehicle.getDistance( )". But I can't find any >> information on how the position or distance of each vehicle is computed >> when it turns left/right into another lane/edge (consider a simple cross >> intersection). It seems like the vehicle disappears from the network when >> it reaches the junction (at least it is not on any edge) and reappears if >> it leaves the junction again. >> >> Does any of you know how those functions are computed? >> >> Best regards, >> >> Duc >> >> >> ------------------------------------------------------------ >> ------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> sumo-user mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/sumo-user >> _______________________________________________ >> sumo-user mailing list >> [email protected] >> To change your delivery options, retrieve your password, or unsubscribe >> from this list, visit >> https://dev.eclipse.org/mailman/listinfo/sumo-user >> > > >
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