Hi Anna-Lena,
roundabouts are modeled as a sequence of priority intersections. Vehicles
entering the roundabout have to yield and thus slow down (even if there is
no other vehicle close by). Further on, vehicles respect the
lane/edge/vehicle class-based speed limits. You can lower the speed limit
on the exit lane of the roundabout if you want the vehicles to slow down
there. Maybe insert a short edge if you want it to happen at a specific
position.
Concerning overtaking: You can raise the probability to overtake with the
lane change model parameter
<https://sumo.dlr.de/docs/Definition_of_Vehicles%2C_Vehicle_Types%2C_and_Routes.html#lane-changing_models>
lcOpposite. The maximum lookahead is currently limited to 150m (see docs
<https://sumo.dlr.de/docs/Simulation/OppositeDirectionDriving.html> ). If
you still think the vehicle in your scenario should overtake but doesn't,
you can share the scenario for further checks.
Best regards
Mirko
-----Original-Nachricht-----
Betreff: [sumo-user] [Sumo] Questions about driving behavior at roundabouts
Datum: 2023-10-13T10:29:39+0200
Von: "Schlamp, Anna-Lena via sumo-user" <[email protected]>
An: "[email protected]" <[email protected]>
Hi,
as part of my research, I am investigating roundabouts in detail. For this
purpose I have modeled a real roundabout in Sumo and added some traffic.
In free flow conditions, a vehicle approaches the roundabout with maximum
allowed speed (in this setting 50 km/h) and slows down to about 14 km/h to
enter the roundabout. For exit, however, there is no braking. The vehicle
exits with the maximum set speed of about 30 km/h for the edge within the
roundabout.
In my opinion, a real driver would not slow down to such a low speed for
entry, but would also slow down before exit.
Therefore the question: Which driving model is defined for driving into, in
and out of the roundabout? How could I change the driving behavior in
principle?
In scenarios with oncoming traffic, I also observed that vehicles do not
enter a gap of suitable size. What is defined here and how can I change
this?
I would be very grateful for any feedback.
Best regards,
AS
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