Re: [sumo-user] Braking distance used for getJunctionFoes - explained

[Mirko Barthauer <m.barthauer@xxxxxxxxxxx>]

Hi Hriday,

 

your braking distance formula seems alright. "egoDist" and "foeDist" refer to different vehicles and by consequence to different distances to a common conflict area. "egoExitDist" and "foeExitDist" refer to the exit of the common conflict area along the respective vehicle path.

 

Best regards

Mirko

 

 

 

-----Original-Nachricht-----

Betreff: Re: [sumo-user] Braking distance used for getJunctionFoes - explained

Datum: 2024-01-05T14:35:51+0100

Von: "Hriday Sanghvi" <sanghvih@xxxxxx>

An: "Mirko Barthauer" <m.barthauer@xxxxxxxxxxx>

 

 

 

Thank you Mirko, what about the braking distance calculation? Am I recalculating something SUMO already calculates and doing it incorrectly? Then, does SUMO provide this information for a vehicle?

Still confused about the exact meaning of some variables, could you clarify please? My understanding of the meaning of the variables:

 

foeId: ID of the vehicle that is considered as a foe (eg., conflicting flow at the intersection)

egoDist: Distance of ego vehicle to the intersection + intersection to foe vehicle
foeDist: Distance of foe vehicle to the intersection + intersection to the ego vehicle (shouldn't this be the same as egoDist then?)
egoExitDist: Distance of ego vehicle to the exit of the conflict area / intersection 

foeExitDist: Distance of foe vehicle to the exit of the conflict area / intersection (which may be the exit of the junction or more upstream - but how can I control this?) 
egoLane: Internal lane ID of the ego vehicle at this intersection/conflict area
foeLane: Internal lane ID of the foe vehicle at this intersection/conflict area
egoResponse: True if foe vehicle has right of way or if ego vehicle is yielding, otherwise False
foeResponse: True if ego vehicle has right of way or if foe vehicle is yielding, otherwise False

 

Please advise.

 

Sincerely,

Hriday

On Thu, 4 Jan 2024 at 07:16, Mirko Barthauer <m.barthauer@xxxxxxxxxxx> wrote:

Hi Hriday,

 

regarding your questions:

a: Distances are sums of euclidean distances of single net elements / stretches between subsequent geometry points along the routes of the vehicles.

b: They give the distance to the exit of the conflict area, which may be the exit of the junction (or more upstream)

c: It is the right-of-way information like defined here in the docs. True => yield

 

Best regards

Mirko

 

 

 

 

-----Original-Nachricht-----

Betreff: [sumo-user] Braking distance used for getJunctionFoes - explained

Datum: 2024-01-03T18:05:43+0100

Von: "Hriday Sanghvi via sumo-user" <sumo-user@xxxxxxxxxxx>

An: "Sumo project User discussions" <sumo-user@xxxxxxxxxxx>

 

 

 

Hello,

 

From TraCI's vehicle domain, I am trying to make use of:

 

getJunctionFoes(self, vehID, dist=0.0)

Return list of junction foes [(foeId, egoDist, foeDist, egoExitDist, foeExitDist, egoLane, foeLane, egoResponse, foeResponse), ...] within the given distance to the given vehicle

 

 

 

1. For the dist parameter, I am calculating maximum braking distance for my ego vehicle as:

square(current_speed) / (2 * max_deceleration_ability) so that ego vehicle can decide to stop in time.

(from the v^2 - u^2 = 2aS formula, assuming constant maximum deceleration and final velocity to be 0). Does that make sense?

 

 

 

2. Sample output that I got using this method:

 

(('flow_btt.0', 38.19626194106837, 31.700000000000003, 41.396261941068374, 34.900000000000006, ':intersection_2_0', ':intersection_1_0', True, False), ...)

 

From that, 

a. Just to confirm, are all the distances calculated using the Euclidean distance formula?

b. I assume the egoExitDist and foeExitDist are the distance till the "exit" of the junction?

c. What is egoResponse and foeRespone?

Thank you,

Sincerely,

Hriday