This is a bug. See https://github.com/eclipse-sumo/sumo/issues/14617
Am Mi., 27. März 2024 um 15:58 Uhr schrieb Daniel Aguilar Marsillach via
sumo-user <sumo-user@eclipse.org>:
> Hi there,
>
> I'm having an issue with headway and lead vehicle identification using
> Traci when a lead vehicle enters a junction. The subscribed headway between
> two vehicles is 0m, but the physical distance is 79.00m. Is this expected?
> Are there any junction parameters or settings that I may be misusing? I'd
> appreciate suggestions on how to get the correct headway directly from
> SUMO/Traci before implementing a correction in the Python API.
>
> *Scenario:*
>
> The vehicle *follower_1* is moving from east to west and is approaching
> the junction. I have circled it in yellow. The vehicle *leader_0* is
> moving from south to north, has just crossed the yield line and is turning
> left, I have circled it in red. Both are IDM controlled vehicles and
> default sumo safety checks are enabled.
>
> The subscribed Traci variables are:
>
> [tc.VAR_LANE_INDEX, tc.VAR_LANEPOSITION, tc.VAR_ROAD_ID, tc.VAR_SPEED,
> tc.VAR_SPEED_LAT,
> tc.VAR_EDGES, tc.VAR_POSITION, tc.VAR_ANGLE,
> tc.VAR_SPEED_WITHOUT_TRACI,
> tc.VAR_FUELCONSUMPTION, tc.VAR_DISTANCE,
> tc.VAR_LANEPOSITION_LAT, tc.VAR_ACCELERATION,
> tc.VAR_WAITING_TIME, tc.VAR_LANE_ID,
> tc.VAR_NEXT_LINKS]
>
> Traci Subscription Results for *follower_1*:
>
> {82: 0, 86: 39.89055103780684, 80: '2', 64: 12.819908744019667, 50: 0.0,
> 84: ('2', '5'), 66: (80.10944896219317, 1.6), 67: 270.0, 177:
> 12.819908744019667, 101: 1346.3627500766254, 132: 34.790551037806836, 184:
> 0.0, 114: 0.5894244551240924, 122: 0.0, 81: '2_0', 51: (('5_0', False,
> False, True, ':junc_4_0', 'm', 's', 14.4),), 104: ('*leader_0*', 0.0)}
>
> Traci Subscription Results for *leader_0*:
>
> {82: 0, 86: 0.026256706772315397, 80: ':junc_8', 64: 3.0363730309804664,
> 50: 0.0, 84: ('0', '5'), 66: (1.5962922005461444, -7.174045403823011), 67:
> 359.95750918840696, 177: 3.0363730309804664, 101: 1104.0259317847099, 132:
> 92.82625670677231, 184: 0.0, 114: 1.463278654968172, 122: 0.0, 81:
> ':junc_8_0', 51: (), 104: ('*leader_4*', 27.97479278915113)}
>
> Note that *104* in the dictionary above is VAR_LEADER and for *follower_1*
> this
> value = 0m and that *51* is VAR_NEXT_LINKS.
>
> I understand that *leader_0* is the lead vehicle for *follower_1* as it
> is the first vehicle to enter the intersection is on a link that overlaps
> with *follower_1*'s route. I also replicated this in another map scenario
> using different .net.xml file and observed the same problem.
>
> Best,
> Daniel
>
>
>
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