diff --git a/src/simulation/scripts/launch_train_multiprocessing.py b/src/simulation/scripts/launch_train_multiprocessing.py
index 527baac..fc01f97 100644
--- a/src/simulation/scripts/launch_train_multiprocessing.py
+++ b/src/simulation/scripts/launch_train_multiprocessing.py
@@ -30,29 +30,7 @@
         ]
     )
 
-    policy_kwargs: Dict[str, Any] = dict(
-        features_extractor_class=c.ExtractorClass,
-        # features_extractor_kwargs=dict(
-        #     device=c.device,
-        # ),
-        activation_fn=nn.ReLU,
-        net_arch=[512, 512, 512],
-    )
-
-    ppo_args: Dict[str, Any] = dict(
-        n_steps=4096,
-        n_epochs=10,
-        batch_size=256,
-        learning_rate=3e-4,
-        gamma=0.99,
-        verbose=1,
-        normalize_advantage=True,
-        device=c.device,
-    )
-
-    save_path = (
-        Path("~/.cache/autotech/checkpoints").expanduser() / c.ExtractorClass.__name__
-    )
+    save_path = c.save_dir / "checkpoints" / c.ExtractorClass.__name__
 
     save_path.mkdir(parents=True, exist_ok=True)
 
@@ -61,12 +39,12 @@
     if valid_files:
         model_path = max(valid_files, key=lambda x: int(x.name.rstrip(".zip")))
         print(f"Loading model {model_path.name}")
-        model = PPO.load(model_path, envs, **ppo_args, policy_kwargs=policy_kwargs)
+        model = PPO.load(model_path, envs, **c.ppo_args, policy_kwargs=c.policy_kwargs)
         i = int(model_path.name.rstrip(".zip")) + 1
         print(f"Model found, loading {model_path}")
 
     else:
-        model = PPO("MlpPolicy", envs, **ppo_args, policy_kwargs=policy_kwargs)
+        model = PPO("MlpPolicy", envs, **c.ppo_args, policy_kwargs=c.policy_kwargs)
 
         i = 0
         print("Model not found, creating a new one")
@@ -83,9 +61,7 @@
     while True:
         onnx_utils.export_onnx(
             model,
-            os.path.expanduser(
-                f"~/.cache/autotech/model_{c.ExtractorClass.__name__}.onnx"
-            ),
+            str(c.save_dir / f"model_{c.ExtractorClass.__name__}.onnx"),
         )
         onnx_utils.test_onnx(model)
 
@@ -93,12 +69,12 @@
             from utils import PlotModelIO
 
             model.learn(
-                total_timesteps=500_000,
+                total_timesteps=c.total_timesteps,
                 progress_bar=False,
                 callback=PlotModelIO(),
             )
         else:
-            model.learn(total_timesteps=500_000, progress_bar=True)
+            model.learn(total_timesteps=c.total_timesteps, progress_bar=True)
 
         print("iteration over")
         # TODO: we could just use a callback to save checkpoints or export the model to onnx
diff --git a/src/simulation/src/simulation/config.py b/src/simulation/src/simulation/config.py
index 1e8864d..5b1dd8c 100644
--- a/src/simulation/src/simulation/config.py
+++ b/src/simulation/src/simulation/config.py
@@ -1,6 +1,9 @@
 # just a file that lets us define some constants that are used in multiple files the simulation
 import logging
+from pathlib import Path
+from typing import Any, Dict
 
+import torch.nn as nn
 from torch.cuda import is_available
 
 from extractors import (  # noqa: F401
@@ -9,6 +12,7 @@
     TemporalResNetExtractor,
 )
 
+# Webots environments config
 n_map = 2
 n_simulations = 1
 n_vehicles = 2
@@ -16,13 +20,43 @@
 n_actions_steering = 16
 n_actions_speed = 16
 lidar_max_range = 12.0
+respawn_on_crash = True  # whether to go backwards or to respawn when crashing
+
+
+# Training config
 device = "cuda" if is_available() else "cpu"
+save_dir = Path("~/.cache/autotech").expanduser()
+total_timesteps = 500_000
+ppo_args: Dict[str, Any] = dict(
+    n_steps=4096,
+    n_epochs=10,
+    batch_size=256,
+    learning_rate=3e-4,
+    gamma=0.99,
+    verbose=1,
+    normalize_advantage=True,
+    device=device,
+)
+
 
+# Common extractor shared between the policy and value networks
+# (cf: https://stable-baselines3.readthedocs.io/en/master/guide/custom_policy.html)
 ExtractorClass = TemporalResNetExtractor
 context_size = ExtractorClass.context_size
 lidar_horizontal_resolution = ExtractorClass.lidar_horizontal_resolution
 camera_horizontal_resolution = ExtractorClass.camera_horizontal_resolution
 n_sensors = ExtractorClass.n_sensors
 
+
+# Architecture of the model
+policy_kwargs: Dict[str, Any] = dict(
+    features_extractor_class=ExtractorClass,
+    activation_fn=nn.ReLU,
+    # Architecture of the MLP heads for the Value and Policy networks
+    net_arch=[512, 512, 512],
+)
+
+
+# Logging config
 LOG_LEVEL = logging.INFO
 FORMATTER = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
diff --git a/src/simulation/src/utils/onnx_utils.py b/src/simulation/src/utils/onnx_utils.py
index 9ff3784..1b90adb 100644
--- a/src/simulation/src/utils/onnx_utils.py
+++ b/src/simulation/src/utils/onnx_utils.py
@@ -54,8 +54,7 @@ def test_onnx(model: OnPolicyAlgorithm):
 
     try:
         class_name = model.policy.features_extractor.__class__.__name__
-        model_path = os.path.expanduser(f"~/.cache/autotech/model_{class_name}.onnx")
-
+        model_path = c.save_dir / f"model_{class_name}.onnx"
         session = ort.InferenceSession(model_path)
     except Exception as e:
         print(f"Error loading ONNX model: {e}")
diff --git a/src/simulation/src/webots/controllers/controller_world_supervisor/controller_world_supervisor.py b/src/simulation/src/webots/controllers/controller_world_supervisor/controller_world_supervisor.py
index 8647300..7b656f4 100644
--- a/src/simulation/src/webots/controllers/controller_world_supervisor/controller_world_supervisor.py
+++ b/src/simulation/src/webots/controllers/controller_world_supervisor/controller_world_supervisor.py
@@ -170,7 +170,7 @@ def step(self):
             done = np.True_
         elif b_collided:
             reward = np.float32(-0.5)
-            done = np.False_
+            done = np.bool(c.respawn_on_crash)
         elif b_past_checkpoint:
             reward = np.float32(1.0)
             done = np.False_