diff --git a/tunnelbridge_cmd.c b/tunnelbridge_cmd.c
--- a/tunnelbridge_cmd.c
+++ b/tunnelbridge_cmd.c
@@ -1357,10 +1357,7 @@ static uint32 VehicleEnter_TunnelBridge(
 		}
 	} else if (IsBridge(tile)) { // XXX is this necessary?
 		if (v->type == VEH_Road || (v->type == VEH_Train && IsFrontEngine(v))) {
-			uint h = GetTileMaxZ(tile);
-
-			if (IsBridgeRamp(tile) ||
-					myabs(h - v->z_pos) > 2) { // high above the ground -> on the bridge
+			if (IsBridgeRamp(tile) || v->z_pos > GetTileMaxZ(tile)) {
 				/* modify speed of vehicle */
 				uint16 spd = _bridge[GetBridgeType(tile)].speed;
 				if (v->type == VEH_Road) spd *= 2;