diff --git a/src/engine.cpp b/src/engine.cpp
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -294,8 +294,10 @@ uint Engine::GetDisplayMaxSpeed() const
 		case VEH_TRAIN:
 			return GetEngineProperty(this->index, PROP_TRAIN_SPEED, this->u.rail.max_speed);
 
-		case VEH_ROAD:
-			return this->u.road.max_speed / 2;
+		case VEH_ROAD: {
+			uint max_speed = GetEngineProperty(this->index, PROP_ROADVEH_SPEED, 0);
+			return (max_speed != 0) ? max_speed * 2 : this->u.road.max_speed / 2;
+		}
 
 		case VEH_SHIP:
 			return GetEngineProperty(this->index, PROP_SHIP_SPEED, this->u.ship.max_speed) / 2;
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -832,7 +832,7 @@ static ChangeInfoResult RoadVehicleChang
 				rvi->weight = buf->ReadByte();
 				break;
 
-			case 0x15: // Speed in mph/0.8
+			case PROP_ROADVEH_SPEED: // Speed in mph/0.8
 				_gted[e->index].rv_max_speed = buf->ReadByte();
 				break;
 
diff --git a/src/newgrf_properties.h b/src/newgrf_properties.h
--- a/src/newgrf_properties.h
+++ b/src/newgrf_properties.h
@@ -32,6 +32,7 @@ enum PropertyID {
 	PROP_ROADVEH_COST_FACTOR                    = 0x11, ///< Purchase cost
 	PROP_ROADVEH_POWER                          = 0x13, ///< Power in 10 HP
 	PROP_ROADVEH_WEIGHT                         = 0x14, ///< Weight in 1/4 t
+	PROP_ROADVEH_SPEED                          = 0x15, ///< Max. speed: 1 unit = 1/0.8 mph = 2 km-ish/h
 	PROP_ROADVEH_TRACTIVE_EFFORT                = 0x18, ///< Tractive effort coefficient in 1/256
 
 	PROP_SHIP_COST_FACTOR                       = 0x0A, ///< Purchase cost
diff --git a/src/roadveh_cmd.cpp b/src/roadveh_cmd.cpp
--- a/src/roadveh_cmd.cpp
+++ b/src/roadveh_cmd.cpp
@@ -192,7 +192,8 @@ void RoadVehUpdateCache(RoadVehicle *v)
 		u->colourmap = PAL_NONE;
 	}
 
-	v->vcache.cached_max_speed = RoadVehInfo(v->engine_type)->max_speed;
+	uint max_speed = GetVehicleProperty(v, PROP_ROADVEH_SPEED, 0);
+	v->vcache.cached_max_speed = (max_speed != 0) ? max_speed * 4 : RoadVehInfo(v->engine_type)->max_speed;
 }
 
 /**