I recommend adding a brief stretch of 3 lane road on edge B followed by a zipper merge junction that continues with a 2 lane edge. This should make vehicles start to zipper merge while on the junction. (see https://sumo.dlr.de/docs/Networks/PlainXML.html#node_types) Regarding the strategic lane choice ahead of the ramp, you could also add a zipper junction where the ramp starts with a connection that allows vehicles from the inner lane to reach the ramp edge. (or maybe at an intermediate point between the junction and the start of the ramp).
regards, Jakob Am Mi., 13. Okt. 2021 um 05:43 Uhr schrieb Tony Kuo <[email protected]>: > Dear all, > > I am currently simulating the traffic conditions around an expressway > ramp, but the simulated situation has always been very different from the > real phenomenon. I have tried to adjust many traffic flow parameters, such > as lcKeepRight, cSpeedGain, lcStrategic, lcLookaheadLeft, > lcCooperativeRoundabout... etc., but the effect it is still not as > expected. I would appreciate if anyone can give me some suggestions on > parameter adjustment, the following is an explanation of the problems: > > > - Characteristics of this intersection: After passing this > intersection, vehicles will enter the highway ramp entrance. > - This intersection has 3 lanes before passing the intersection, and > there are only 2 lanes after passing the intersection. In reality, the > outer two lanes will slowly converge after entering the intersection and > entering the outside lane (It has been set through CONNECTION MODE in > the road network editing, as shown in Figure 1). However, in the > simulation, the vehicle will have too much comity in order to avoid > collisions, resulting in very low efficiency at the intersection. > - Many vehicles will use the inner lane to pass through the > intersection, then change lanes to the outside lane, and finally enter the > ramp, similar to the trajectory of Figure 2 > > <https://drive.google.com/file/d/1dLTqT21B-SHwWxQwGovci6YFbkAa0vGO/view?usp=sharing>. > But in the situation I simulated, the vehicle will drive in the > outside lane before passing the intersection. Few vehicles behave the same > as the above, and this is also different from the real environment. I tried > to adjust lcStrategic or other parameters, but the effect is still limited. > > Attached to the letter are images of the current situation and simulated > videos (real > <https://drive.google.com/file/d/1dLZggkez1gbTXK_Wd3x9-YFfMC5ndJfy/view>, > simulated > <https://drive.google.com/file/d/1dLdJ78PKxnPP6o1HIY219K72OCvozdQ4/view>). > It can be found that at the same green light time, the number of vehicles > passing through the intersection is very different, and many vehicles use > the inner lane to pass through the intersection, then change to the outer > lane, and finally enter the ramp. I would appreciate it if anyone can > give me some suggestions on parameter adjustment, thank you! > > > Figure 1 (Comparison of actual conditions and simulated road networks): > > https://drive.google.com/file/d/15us8UXjKEckBnzszoShHVUoeXO_P1tv3/preview > > Figure 2 (In the real environment, the lane change trajectory and position > of the vehicle before entering the ramp) > > https://drive.google.com/file/d/1dLTqT21B-SHwWxQwGovci6YFbkAa0vGO/view > > Video (real environment traffic flow) > https://drive.google.com/file/d/1dLZggkez1gbTXK_Wd3x9-YFfMC5ndJfy/view?usp=sharing > > Video (simulated traffic flow) > > https://drive.google.com/file/d/1dLdJ78PKxnPP6o1HIY219K72OCvozdQ4/view?usp=sharing > > > > Sincerely > > Tony Kuo > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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