diff --git a/src/bridge_gui.cpp b/src/bridge_gui.cpp
index de56fe0640..9971951ca6 100644
--- a/src/bridge_gui.cpp
+++ b/src/bridge_gui.cpp
@@ -420,7 +420,11 @@ void ShowBuildBridgeWindow(TileIndex start, TileIndex end, TransportType transpo
 
 		Money infra_cost = 0;
 		switch (transport_type) {
-			case TRANSPORT_ROAD: infra_cost = (bridge_len + 2) * _price[PR_BUILD_ROAD] * 2; break;
+			case TRANSPORT_ROAD:
+				infra_cost = (bridge_len + 2) * _price[PR_BUILD_ROAD] * 2;
+				/* In case we add a new road type as well, we must be aware of those costs. */
+				if (IsBridgeTile(start)) infra_cost *= CountBits(GetRoadTypes(start) | (RoadTypes)road_rail_type);
+				break;
 			case TRANSPORT_RAIL: infra_cost = (bridge_len + 2) * RailBuildCost((RailType)road_rail_type); break;
 			default: break;
 		}
diff --git a/src/tunnelbridge_cmd.cpp b/src/tunnelbridge_cmd.cpp
index 51323f0c15..ec98fc1cef 100644
--- a/src/tunnelbridge_cmd.cpp
+++ b/src/tunnelbridge_cmd.cpp
@@ -474,7 +474,7 @@ CommandCost CmdBuildBridge(TileIndex end_tile, DoCommandFlag flags, uint32 p1, u
 		bridge_len += 2; // begin and end tiles/ramps
 
 		switch (transport_type) {
-			case TRANSPORT_ROAD: cost.AddCost(bridge_len * _price[PR_BUILD_ROAD] * 2); break;
+			case TRANSPORT_ROAD: cost.AddCost(bridge_len * _price[PR_BUILD_ROAD] * 2 * CountBits(roadtypes)); break;
 			case TRANSPORT_RAIL: cost.AddCost(bridge_len * RailBuildCost(railtype)); break;
 			default: break;
 		}