Sir,
As I mentioned earlier, I am currently studying the implementation of
KraussOrig1 model. Sir, I have a few questions about it.
1. I don't understand the macros ACCEL2SPEED, SPEED2ACCEL, DIST2SPEED.
2. I don't completely understand the following function, their
implementation, and use.
2.1 double MSCFModel::maximumSafeFollowSpeed(double gap, double
egoSpeed, double predSpeed, double predMaxDecel, bool onInsertion)
2.2 double MSCFModel::maximumSafeStopSpeed(double g /*gap*/, double v
/*currentSpeed*/, bool onInsertion, double headway)
2.3 double MSCFModel::brakeGap(const double speed, const double decel,
const double headwayTime)
Can you please guide me through this?
Thanks and regards
Shantanu Phanse
On Fri, Jan 8, 2021 at 6:39 PM Jakob Erdmann <namdre.s...@gmail.com> wrote:
> Hello,
> even the kraussOrig Model has quite some deviations from the work of
> Krauss. It is based directly on equation 4.8 in the dissertation and
> actually is more like the approach of Gipps discussed at the start of
> Section 5.1. (vSafe is derived directly from braking distance which are
> quadratic in speed).
> The exact commit where the original Krauss equation was changed to the
> current version dates to 2007 (
> https://github.com/eclipse/sumo/commit/6f7b1d5ffba1ac575988efc5f59b6d6d376a1345#diff-41a035c9bfbce931e5a134ddb3f95190657aa6b183d8db8dfc4a48797d3dfc8c
> )
> I would assume this was done to fix collisions but the exact reason would
> have to be given by D. Krajewicz.
>
> Some points of note when relating Krauss to KraussOrig1:
> - in the SUMO-Krauss model (not KraussOrig1), braking distances are
> computed depending on the position update rule since an euler-like update
> (move with the speed of the current step) leads to other braking distances
> than a ballistic update (move with the average speed of previous and
> current step).
> - follow speed is a special case of stopping speed (where stop distance =
> gap + leaderBrakeGap)
> - special care is taken when vehicles have different braking capabilities
> because the Krauss equation 4.8 does not guarantee save driving in this
> case (https://arxiv.org/abs/1902.04927)
>
> regards,
> Jakob
>
> Am Fr., 8. Jan. 2021 um 12:02 Uhr schrieb SHANTANU PHANSE <
> 201911...@daiict.ac.in>:
>
>>
>> Hello Sir/Mam,
>>
>> I am new to SUMO. I am learning about the microscopic car following
>> model. My problem is that I am unable to relate the kraussOrig model in the
>> simulator and the krauss model's theory. I am referring to the attached
>> papers for the theory.
>>
>> Please guide me through this.
>>
>> Thanks and Regards
>> Shantanu Phanse
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