Index: src/tunnelbridge_cmd.cpp
===================================================================
--- src/tunnelbridge_cmd.cpp	(wersja 24818)
+++ src/tunnelbridge_cmd.cpp	(kopia robocza)
@@ -454,18 +454,32 @@
 				SetTunnelBridgeReservation(tile_end,   pbs_reservation);
 				break;
 
-			case TRANSPORT_ROAD:
+			case TRANSPORT_ROAD: {
+			    RoadTypes prev_roadtypes = IsBridgeTile(tile_start) ? GetRoadTypes(tile_start) : ROADTYPES_NONE;
+				RoadType rt;
+
 				if (c != NULL) {
 					/* Add all new road types to the company infrastructure counter. */
-					RoadType new_rt;
-					FOR_EACH_SET_ROADTYPE(new_rt, roadtypes ^ (IsBridgeTile(tile_start) ? GetRoadTypes(tile_start) : ROADTYPES_NONE)) {
+					FOR_EACH_SET_ROADTYPE(rt, roadtypes ^ prev_roadtypes) {
 						/* A full diagonal road tile has two road bits. */
-						Company::Get(owner)->infrastructure.road[new_rt] += (bridge_len + 2) * 2 * TUNNELBRIDGE_TRACKBIT_FACTOR;
+						Company::Get(owner)->infrastructure.road[rt] += (bridge_len + 2) * 2 * TUNNELBRIDGE_TRACKBIT_FACTOR;
 					}
 				}
+
+				/* Remember previous owners */
+				Owner prev_owners[ROADTYPE_END];
+				FOR_EACH_SET_ROADTYPE(rt, prev_roadtypes) prev_owners[rt] = GetRoadOwner(tile_start, rt);
+
 				MakeRoadBridgeRamp(tile_start, owner, bridge_type, dir,                 roadtypes);
 				MakeRoadBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), roadtypes);
+
+				/* Restore previous owners */
+				FOR_EACH_SET_ROADTYPE(rt, prev_roadtypes) {
+					SetRoadOwner(tile_start, rt, prev_owners[rt]);
+					SetRoadOwner(tile_end, rt, prev_owners[rt]);
+				}
 				break;
+			}
 
 			case TRANSPORT_WATER:
 				if (!IsBridgeTile(tile_start) && c != NULL) c->infrastructure.water += (bridge_len + 2) * TUNNELBRIDGE_TRACKBIT_FACTOR;