diff --git a/routing/routing_integration_tests/route_test.cpp b/routing/routing_integration_tests/route_test.cpp
index 5d9af5a67a..1886899d06 100644
--- a/routing/routing_integration_tests/route_test.cpp
+++ b/routing/routing_integration_tests/route_test.cpp
@@ -402,7 +402,7 @@ namespace
     TEST_EQUAL(result, IRouter::NoError, ());
   }
 
-  // Test on decreasing speed factor on roads with bad cover.
+  // Test of decreasing speed factor on roads with bad cover.
   UNIT_TEST(RussiaLenOblSpeedFactorsTest)
   {
     integration::CalculateRouteAndTestRouteLength(
@@ -411,7 +411,7 @@ namespace
         MercatorBounds::FromLatLon(60.28975, 29.79399), 11618.1);
   }
 
-  // Test on decreasing speed factor on roads with bad cover.
+  // Test of decreasing speed factor on roads with bad cover.
   UNIT_TEST(RussiaMosOblSpeedFactorsTest)
   {
     integration::CalculateRouteAndTestRouteLength(
diff --git a/routing_common/bicycle_model.cpp b/routing_common/bicycle_model.cpp
index 17c1f940a6..01bb603fb2 100644
--- a/routing_common/bicycle_model.cpp
+++ b/routing_common/bicycle_model.cpp
@@ -422,7 +422,7 @@ VehicleModel::SurfaceInitList const g_bicycleSurface = {
     {{"psurface", "paved_good"}, 1.0},
     {{"psurface", "paved_bad"}, 0.8},
     {{"psurface", "unpaved_good"}, 1.0},
-    {{"psurface", "unpaved_bad"}, 0.6},
+    {{"psurface", "unpaved_bad"}, 0.3},
 };
 }  // namespace
 
diff --git a/routing_common/car_model.cpp b/routing_common/car_model.cpp
index 7017487667..cee375d37f 100644
--- a/routing_common/car_model.cpp
+++ b/routing_common/car_model.cpp
@@ -202,9 +202,9 @@ vector<VehicleModel::AdditionalRoadTags> const kAdditionalTags = {
 
 VehicleModel::SurfaceInitList const g_carSurface = {
     {{"psurface", "paved_good"}, 1.0},
-    {{"psurface", "paved_bad"}, 0.6},
+    {{"psurface", "paved_bad"}, 0.5},
     {{"psurface", "unpaved_good"}, 0.8},
-    {{"psurface", "unpaved_bad"}, 0.4},
+    {{"psurface", "unpaved_bad"}, 0.3},
 };
 }  // namespace
 
diff --git a/routing_common/vehicle_model.cpp b/routing_common/vehicle_model.cpp
index ac41f108be..3474b4484d 100644
--- a/routing_common/vehicle_model.cpp
+++ b/routing_common/vehicle_model.cpp
@@ -97,7 +97,8 @@ double VehicleModel::GetMinTypeSpeed(feature::TypesHolder const & types) const
       speedFactor = min(speedFactor, itFactor->m_factor);
   }
 
-  if (speed <= m_maxSpeedKMpH && speedFactor <= 1.0)
+  ASSERT_LESS_OR_EQUAL(speedFactor, 1.0, ());
+  if (speed <= m_maxSpeedKMpH)
     return speed * speedFactor;
 
   return 0.0 /* Speed */;