Dear developers,        Hello! I am now using Traci to control the behavior of 
vehicles in intersections. I have Three questions to discuss with you.   
Firstly, the traci.vehicle.getSpeed() and traci.vehicle.getAccl() all returns a 
scalar value, what does it mean when the vehicles is turning in the 
intersections? If I want to know the component of speed and acceleration in 
x-axis and y-axis, is it correct to use Angle to calculate?     Secondly, do 
you have a function to predict the vehicle position in the next time step? I 
find it not accurate if I use the current speed and acceleration to calculate 
the next position.      Thirdly, do you have any method to precisely control 
the acceleration of the vehicle? traci.vehicle.setAcceleration() only sets the 
optimal maximum value, but can't control it precisely.
        Looking forward to your reply.
Best wishes,Duowei

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