Re: [sumo-user] traci slowDown method

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

Intermediate acceleration should not happen in the time frame specified in the slowDown command (unless the given speed is above the current vehicle speed).

I would recommend that you log whether unintended intermediate calls to setSpeed are happening as these would explain the observed behavior.

Am Di., 16. Juni 2020 um 23:58 Uhr schrieb Ishan Dindorkar <ishandindorkar333@xxxxxxxxx>:

Dear Jacob,

Thank you for your response.

I increased the default acceleration of the ego vehicle from default 2.6 m/s^2, hence you can see values like 20 m/s^2. Following is an extract of logic I am using -

if <some condition>: 

# this condition basically checks if distance between pedestrian and ego vehicle is below some threshold limit

traci.vehicle.slowDown(ego_veh_id, 0.0, 15.0)

traci.vehicle.setSignal(ego_veh_id, 3) # set signal for emergency braking

else:

traci.vehicle.setSpeed(ego_veh_id, -1) # giving control of ego vehicle back to SUMO, hence setting speed as -1

Could you please advise if I am making any mistake?

Thank you.

Sincerely,

Ishan Dindorkar

On Wed, Jun 17, 2020 at 1:38 AM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:

Since one of your time steps shows an acceleration of 20m/s^2 I'm guessing that other traci commands are in play that override the speed timeline. By default vehicle acceleration is limited to 2.6m/s^2

Am Di., 16. Juni 2020 um 16:47 Uhr schrieb Ishan Dindorkar <ishandindorkar333@xxxxxxxxx>:

Dear Jacob,

Thank you for your response.

I created a document that shows how I am using slowDown() method and also included screenshots of change in velocity.

Please find attached the same.

Sincerely,

Ishan Dindorkar

On Tue, Jun 16, 2020 at 12:29 PM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:

please describe the exact arguments passed to slowDown and the sequence of speeds you observed in successive time steps over the given time span.

Am Di., 16. Juni 2020 um 07:42 Uhr schrieb Ishan Dindorkar <ishandindorkar333@xxxxxxxxx>:

Dear Community,

I had been exploring the use of slowDown() while using traci API to control the simulation. The description of the method says - 

"Changes the speed smoothly to the given value over the given amount of time in seconds (can also be used to increase speed)."

While using the method, I observed that speed is not consistently reducing. During some timesteps, I saw speed is also increased after issuing the slowDown command. Is it expected behaviour? My goal is to bring the vehicle to complete halt.

Please advise.

Thank you

Sincerely,

Ishan Dindorkar

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