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[sumo-user] Questions on SUMO Built-In Functions (getSecureGap & brakeGap)
  • From: "Bae, Jong In" <jbae42@xxxxxxxxxx>
  • Date: Sun, 12 Apr 2020 21:03:48 +0000
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  • Thread-topic: Questions on SUMO Built-In Functions (getSecureGap & brakeGap)
Hi,


  1. Could you verify the meaning of each argument of the two functions? 
getSecureGap
  • myDecel - current deceleration rate of the subject vehicle (the one attempting to merge)
  • leaderMaxDecel - current deceleration rate of the leading vehicle (vehicle preceding to the lane change area)
brakeGap
  • speed - current speed of the subject vehicle
  • myHeadwayTime - Tau value of the subject vehicle (is this the same as headwayTime argument?)
  • leaderSpeed - current speed of the leader vehicle
  • ACCEL2SPEED - is the formula available? (the time.h file only says the formula as x/deltaT; what are these parameters?)
  • SPEED2DIST - is the formula available?

2. In the required gap equation = secureBackGap + subjectLength + subjectMinGap + secureFrontGap, how are 'secureBackGap' and 'secureFrontGap' determined in the 'getSecureGap'?
Is it simply using follower vehicle's deceleration and speed for 'secureBackGap' and leader vehicle data for 'secureFrontGap'?

Thank you in advance for your assistance.

-James Bae

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