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Re: [sumo-user] Inconsistent space headway
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Hi Ahsen,
This behaviour is compliant with how traci.vehicle.getLeader is specified. The minGap distance of the follower is excluded (2.5 is the default value). See the description in the python TraCI reference.
Best regards,
Mirko
-----Original-Nachricht-----
Betreff: [sumo-user] Inconsistent space headway
Datum: 2024-10-24T20:54:36+0200
Von: "Ahsen Hamid via sumo-user" <sumo-user@xxxxxxxxxxx>
An: "Sumo project User discussions" <sumo-user@xxxxxxxxxxx>
Hi
Let's say we are running the following scenario.
ego_x, ego_y = traci.vehicle.getPosition(x)
leader=traci.vehicle.getLeader(x)
leader_id=leader[0]
leader_pos_1=leader[1]
leader_pos_2x, leader_pos_2y=traci.vehicle.getPosition(leader_id)
The headway between two cars computed either way is not consistent rather always gives a difference of 2.5 which I presume equals to the standstill distance between the two vehicles. The following equation describes the relation.
leader_pos_1 = leader_pos_2x-ego_x-length-2.5
The attached image shows calculations from my outputs. column a is leader_pos_2x - ego_x - length and column b is leader_pos_1 - a.
Why am I seeing this difference and which of these two values is to be trusted as the real space headway between the two vehicles at any time instance?
Thanks
Ahsen
