[sumo-user] Definition of Brake Gap in secureBackGap and secureFrontGap

[Bae, Jong In]

Hello,

In the source code of Krauss model's secureBackGap and secureFrontGap, the model is calculating 'follower brake gap' and 'leader brake gap'.

What would be the definitions of these two terms?

Also, would I be correct if I understand secureBackGap and secureFrontGap as the distance that follower and leader require to safely slow down?

If so, what is the speed that the follower and leader are slowing down to?

Thank you!

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[Jakob Erdmann]

In the source code of Krauss model's secureBackGap and secureFrontGap, the model is calculating 'follower brake gap' and 'leader brake gap'.

What would be the definitions of these two terms?

Please link the code directly (i.e. https://github.com/eclipse/sumo/blob/master/src/microsim/MSLaneChanger.cpp#L800-L801)

Also, would I be correct if I understand secureBackGap and secureFrontGap as the distance that follower and leader require to safely slow down?

If so, what is the speed that the follower and leader are slowing down to?

It is the distance that the car following model deems "secure". For 'Krauss' this would be the minimum distance at which no collision occurs if the leader and follower brake to standstill from their current speeds with their configured deceleration (after reaction time tau of the follower). Other models (i.e. IDM) have a different implementation of getSecureGap.

 

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[Bae, Jong In]

Please see the link (https://github.com/eclipse/sumo/blob/3a3be608d2408d7cbf10f6bba939254ef439c209/src/microsim/cfmodels/MSCFModel.h#L333-L339) for the code that I am referring to. 

In this code, what would be the definition of brake gap?

Thank you!

---

From: sumo-user <[hidden email]> on behalf of Jakob Erdmann <[hidden email]>
Sent: Tuesday, January 12, 2021 4:20 AM
To: Sumo project User discussions <[hidden email]>
Subject: Re: [sumo-user] Definition of Brake Gap in secureBackGap and secureFrontGap

 

In the source code of Krauss model's secureBackGap and secureFrontGap, the model is calculating 'follower brake gap' and 'leader brake gap'.

What would be the definitions of these two terms?

Please link the code directly (i.e. https://github.com/eclipse/sumo/blob/master/src/microsim/MSLaneChanger.cpp#L800-L801)

Also, would I be correct if I understand secureBackGap and secureFrontGap as the distance that follower and leader require to safely slow down?

If so, what is the speed that the follower and leader are slowing down to?

It is the distance that the car following model deems "secure". For 'Krauss' this would be the minimum distance at which no collision occurs if the leader and follower brake to standstill from their current speeds with their configured deceleration (after reaction time tau of the follower). Other models (i.e. IDM) have a different implementation of getSecureGap.

 

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[Jakob Erdmann]

see https://github.com/eclipse/sumo/blob/24c710ffcbdbdadb829c1958cdd7667665ac0452/src/microsim/cfmodels/MSCFModel.cpp#L73-L94

Am Di., 12. Jan. 2021 um 16:43 Uhr schrieb Bae, Jong In <[hidden email]>:

Please see the link (https://github.com/eclipse/sumo/blob/3a3be608d2408d7cbf10f6bba939254ef439c209/src/microsim/cfmodels/MSCFModel.h#L333-L339) for the code that I am referring to. 

In this code, what would be the definition of brake gap?

Thank you!

---

From: sumo-user <[hidden email]> on behalf of Jakob Erdmann <[hidden email]>
Sent: Tuesday, January 12, 2021 4:20 AM
To: Sumo project User discussions <[hidden email]>
Subject: Re: [sumo-user] Definition of Brake Gap in secureBackGap and secureFrontGap

 

In the source code of Krauss model's secureBackGap and secureFrontGap, the model is calculating 'follower brake gap' and 'leader brake gap'.

What would be the definitions of these two terms?

Please link the code directly (i.e. https://github.com/eclipse/sumo/blob/master/src/microsim/MSLaneChanger.cpp#L800-L801)

Also, would I be correct if I understand secureBackGap and secureFrontGap as the distance that follower and leader require to safely slow down?

If so, what is the speed that the follower and leader are slowing down to?

It is the distance that the car following model deems "secure". For 'Krauss' this would be the minimum distance at which no collision occurs if the leader and follower brake to standstill from their current speeds with their configured deceleration (after reaction time tau of the follower). Other models (i.e. IDM) have a different implementation of getSecureGap.

 

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