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Re: [sumo-user] Gap acceptance in lane changing
1) yes
2) these are computed by the car-follow model functions. They generally are consistent with the followSpeed function so that neither the ego vehicle nor its follower on the target lane have to perform any extra braking after the lane change is completed.
3) if a jam develops immediately after lane changing, vehicles must still be able to maintain the configured minGap, thus the value is already considered during lane changing



Am Fr., 19. Juni 2020 um 11:26 Uhr schrieb Solmaz Razmi Rad - CITG <S.RazmiRad@xxxxxxxxxx>:

Hi there,

 

I am trying to investigate the impact of gap acceptance in lane changing around on-ramps on the capacity of a freeway. I want to use a distribution for the gaps accepted while lane changing. I realized that the parameter which controls the gap acceptance is “lcAssertive” (But if I understood correctly, lcAssertive can influence the size of accepted gap but it doesn’t define the gap itself) . The SUMO vehicle definitions state that "the required gap is divided by the value of lcAssertive". When searching for the definition of requiredGap, I came across this page ( http://sumo-user-mailing-list.90755.n8.nabble.com/sumo-user-lcAssertive-Behavior-td3244.html ) where Jakob explained about requiredGap:  “requiredGap = secureBackGap + followerMinGap + subjectLength + subjectMinGap + secureFrontGap”.

I have a couple of questions here:

1.        What exactly is requiredGap? Is this the same as the accepted gap in lane changing?

2.        How are secureBackGap or secureFrontGap defined? Is there any relation between tau and secureBackGap or secureFrontGap?

3.       From what I have understood, MinGap is the jam distance or the distance which vehicles keep when standstill. How does this contribute to gap acceptance in lane changing?

I appreciate your help in advance.

 

Regards,

Solmaz

 

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