diff --git a/flow/core/params.py b/flow/core/params.py
index 5a7467580..6d1684731 100755
--- a/flow/core/params.py
+++ b/flow/core/params.py
@@ -363,6 +363,9 @@ class SimParams(object):
     ----------
     sim_step : float optional
         seconds per simulation step; 0.1 by default
+    scale : float optional
+        scale demand by the given factor (by discarding or
+        duplicating vehicles); 1.0 by default
     render : str or bool, optional
         specifies whether to visualize the rollout(s)
 
@@ -395,6 +398,7 @@ class SimParams(object):
 
     def __init__(self,
                  sim_step=0.1,
+                 scale=1.0,
                  render=False,
                  restart_instance=False,
                  emission_path=None,
@@ -405,6 +409,7 @@ def __init__(self,
                  force_color_update=False):
         """Instantiate SimParams."""
         self.sim_step = sim_step
+        self.scale = scale
         self.render = render
         self.restart_instance = restart_instance
         self.emission_path = emission_path
@@ -516,6 +521,9 @@ class SumoParams(SimParams):
         Port for Traci to connect to; finds an empty port by default
     sim_step : float optional
         seconds per simulation step; 0.1 by default
+    scale : float optional
+        scale demand by the given factor (by discarding or
+        duplicating vehicles); 1.0 by default
     emission_path : str, optional
         Path to the folder in which to create the emissions output.
         Emissions output is not generated if this value is not specified
@@ -573,6 +581,7 @@ class SumoParams(SimParams):
     def __init__(self,
                  port=None,
                  sim_step=0.1,
+                 scale=1.0,
                  emission_path=None,
                  lateral_resolution=None,
                  no_step_log=True,
@@ -592,9 +601,10 @@ def __init__(self,
                  use_ballistic=False):
         """Instantiate SumoParams."""
         super(SumoParams, self).__init__(
-            sim_step, render, restart_instance, emission_path, save_render,
+            sim_step, scale, render, restart_instance, emission_path, save_render,
             sight_radius, show_radius, pxpm, force_color_update)
         self.port = port
+        self.scale = scale
         self.lateral_resolution = lateral_resolution
         self.no_step_log = no_step_log
         self.seed = seed
diff --git a/flow/visualize/visualizer_rllib.py b/flow/visualize/visualizer_rllib.py
index 8c38a91c1..cc8b77d71 100644
--- a/flow/visualize/visualizer_rllib.py
+++ b/flow/visualize/visualizer_rllib.py
@@ -73,6 +73,7 @@ def visualizer_rllib(args):
     # TODO(ev) remove eventually
     sim_params = flow_params['sim']
     setattr(sim_params, 'num_clients', 1)
+    setattr(sim_params, 'scale', 1)
 
     # for hacks for old pkl files TODO: remove eventually
     if not hasattr(sim_params, 'use_ballistic'):
@@ -351,6 +352,11 @@ def create_parser():
         type=int,
         default=1,
         help='The number of rollouts to visualize.')
+    parser.add_argument(
+        '--scale',
+        type=float,
+        default=1.0,
+        help='Scale demand by the given factor.')
     parser.add_argument(
         '--gen_emission',
         action='store_true',