Hi Shuyi,
there are different approaches to control traffic lights depending on
the traffic.
One is to look for gaps in the incoming traffic flow (see
http://sumo.dlr.de/wiki/Simulation/Traffic_Lights#Improving_Generated_programs_with_knowledge_about_traffic_demand
and
http://sumo.dlr.de/wiki/Simulation/Traffic_Lights#Actuated_Traffic_Lights)
For your approach see also the discussion recently here about "Locating
cars around certain coordinates"
Best regards, Harald
Am 25.07.2018 um 23:43 schrieb Shuyi Yin:
Hi SUMO community,
I'm using TraCI to control traffic lights and would like the traffic
light to know the number of cars approaching it. Also, I'm only
interested in counting vehicles that are close enough, i.e. within 20
meters.
My current implementation is to get the ID of vehicles on a lane and
calculate the distance to the junction. Code is shown as follows. But
is there a more efficient way fo doing so?
Thanks,
Shuyi
def numberv(lane):
nb = 0
for k in traci.lane.getLastStepVehicleIDs(lane):
if traci.vehicle.getLanePosition(k) < X-100:
nb += 1
return nb
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