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Re: [sumo-user] Questions about lane change mode (0xb6) and speed mode (0xb3)
Hello,
1) the safety gap is computed as if the vehicles were in a car-following relationship on the target lane. This means it is subject to car-follow model parameters. In the latest development version, all lane change models support the parameter lcAssertive which allows modifying the computed safetey distance by a custom factor.

2) it means that the ego vehicle and other vehicles will adapt their speed so that lane change becomes possible (if it isn't possible at the moment). If the speed is overwrittten by setSpeed than this coordination may not work.

3) If all checks are on, the highest priority is given to maximum deceleration (attribute emergencyDecel), then safe speed then acceleration

regards,
Jakob

2018-07-11 13:09 GMT+02:00 Tong, Kailin <Kailin.Tong@xxxxxxx>:

Dear SUMO users,

 

In http://sumo.dlr.de/wiki/TraCI/Change_Vehicle_State#lane_change_mode_.280xb6.29

 

It says:

To disable all autonomous changing but still handle safety checks in the simulation, either one of the modes 256 (collision avoidance) or 512 (collision avoidance and safety-gap enforcement) may be used.

 

  • When the mode is 512, how is the safety-gap of others calculated?

 

bit9, bit8:

·         00 = do not respect other drivers when following TraCI requests, adapt speed to fulfill request

·         01 = avoid immediate collisions when following a TraCI request, adapt speed to fulfill request

 

  • What is adapt speed to fulfill request means here? What will happen if the speed is overwritten by traci.vehicle.setSpeed ?

 

 

In http://sumo.dlr.de/wiki/TraCI/Change_Vehicle_State#speed_mode_.280xb3.29

 

  • If all checks of speed mode on, traci.vehicle.setSpeed sets a speed over the safe speed / maximum acceleration / maximum deceleration, which one has a higher priority?

 

 

Thank you in advance!

 

Best regards,

Kailin

 

 


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