diff --git a/src/AIModel/AIBase.cxx b/src/AIModel/AIBase.cxx
index b5459a38f..ce3968b90 100644
--- a/src/AIModel/AIBase.cxx
+++ b/src/AIModel/AIBase.cxx
@@ -137,7 +137,7 @@ bool FGAIBase::init() {
 
    if (model_path != "") {
       model = load3DModel( globals->get_fg_root(),
-	                     model_path.c_str(),
+	                     SGPath(model_path).c_str(),
                              props,
 	                     globals->get_sim_time_sec() );
    }
diff --git a/src/Main/fg_init.cxx b/src/Main/fg_init.cxx
index 2215fd295..8dcefe3d1 100644
--- a/src/Main/fg_init.cxx
+++ b/src/Main/fg_init.cxx
@@ -1709,8 +1709,9 @@ bool fgInitSubsystems() {
      globals->add_subsystem("Traffic Manager", new FGTrafficManager);
 	     FGTrafficManager *dispatcher = 
 	     (FGTrafficManager*) globals->get_subsystem("Traffic Manager");
-
-     readXML(string(globals->get_fg_root() + string("/Traffic/fgtraffic.xml")),
+	     SGPath path =globals->get_fg_root();
+	     path.append("Traffic/fgtraffic.xml");
+     readXML(path.str(),
 	     *dispatcher);
      globals->get_subsystem("Traffic Manager")->init();
 
diff --git a/src/Traffic/TrafficMgr.cxx b/src/Traffic/TrafficMgr.cxx
index ca663a8d2..9e6dded35 100644
--- a/src/Traffic/TrafficMgr.cxx
+++ b/src/Traffic/TrafficMgr.cxx
@@ -47,6 +47,7 @@
 #include <simgear/compiler.h>
 #include <simgear/math/polar3d.hxx>
 #include <simgear/math/sg_geodesy.hxx>
+#include <simgear/misc/sg_path.hxx>
 #include <simgear/props/props.hxx>
 #include <simgear/route/waypoint.hxx>
 #include <simgear/structure/subsystem_mgr.hxx>
@@ -127,11 +128,11 @@ void  FGTrafficManager::startElement (const char * name, const XMLAttributes &at
   if (attval != 0)
       {
 	//cout << "including " << attval << endl;
-	string path = 
-	  globals->get_fg_root()   + 
-	  string("/Traffic/")      + 
-	  string(attval);
-	readXML(path, *this);
+	SGPath path = 
+	  globals->get_fg_root();
+	path.append("/Traffic/");
+	path.append(attval);
+	readXML(path.str(), *this);
       }
   //  cout << "  " << atts.getName(i) << '=' << atts.getValue(i) << endl; 
 }