SumoVehicleType newVehicleType;
newVehicleType = new SumoVehicleType(id, accel, decel, length, maxSpeed, sigma);
newVehicleType.setColor(r, g, b);
sumoManager.addVehicleType(newVehicleType);
} catch (NullPointerException e) {
System.err.println("missing vehicle type attribute");
e.printStackTrace();
}