[sumo-user] Lane reduction parameters after passing the intersection

[Tony Kuo <sungting.tw@xxxxxxxxx>]

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. 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, simulated). 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