Re: [sumo-user] Efficient way to count #vehicles within a distance of ju

[Shuyi Yin <shuyi.yin1@xxxxxxxxx>]

Hi Harald,

Thank you for letting me know the other approaches: they may be worthwhile to explore in the future. And equally thankful for pointing me to that discussion.

Sincerely,

Shuyi

On Thu, Jul 26, 2018 at 12:15 AM Harald Schaefer <haraldschaefer@xxxxxxxxxxx> wrote:

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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