Observation

The default observation for each traffic signal agent is a vector:

    obs = [phase_one_hot, min_green, lane_1_density,...,lane_n_density, lane_1_queue,...,lane_n_queue]

• phase_one_hot is a one-hot encoded vector indicating the current active green phase

• min_green is a binary variable indicating whether min_green seconds have already passed in the current phase

• lane_i_density is the number of vehicles in incoming lane i dividided by the total capacity of the lane

• lane_i_queueis the number of queued (speed below 0.1 m/s) vehicles in incoming lane i divided by the total capacity of the lane

You can define your own observation by implementing a class that inherits from ObservationFunction and passing it to the environment constructor.