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diff --git a/game/server/ai_route.h b/game/server/ai_route.h
new file mode 100644
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+++ b/game/server/ai_route.h
@@ -0,0 +1,190 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef AI_ROUTE_H
+#define AI_ROUTE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "ai_basenpc.h"
+#include "mathlib/vector.h"
+#include "ai_network.h"
+#include "ai_node.h"
+#include "ai_waypoint.h"
+
+struct AI_Waypoint_t;
+struct OverlayLine_t;
+
+class CAI_BaseNPC;
+
+//=============================================================================
+//	>> CAI_Path
+//=============================================================================
+
+#define DEF_WAYPOINT_TOLERANCE (0.1)
+
+class CAI_Path
+{
+//-----------------------------------------------------------------
+
+public:
+
+	void			SetWaypoints(AI_Waypoint_t* route, bool fSetGoalFromLast = false) ;
+
+	void 			PrependWaypoints( AI_Waypoint_t *pWaypoints );
+	void 			PrependWaypoint( const Vector &newPoint, Navigation_t navType, unsigned waypointFlags );
+
+	bool 			IsEmpty() const				{ return m_Waypoints.IsEmpty(); }
+
+	AI_Waypoint_t *	GetCurWaypoint() 				{ return m_Waypoints.GetFirst(); }
+	const AI_Waypoint_t *GetCurWaypoint() const 	{ return m_Waypoints.GetFirst(); }
+
+	AI_Waypoint_t *	GetGoalWaypoint() 				{ return m_Waypoints.GetLast(); }
+	const AI_Waypoint_t *GetGoalWaypoint() const 	{ return m_Waypoints.GetLast(); }
+
+	const Vector &	CurWaypointPos() const;
+	const Vector &	NextWaypointPos() const;
+	float			CurWaypointYaw() const;
+	int				CurWaypointFlags() const;
+	Navigation_t	CurWaypointNavType() const;
+
+	AI_Waypoint_t * GetTransitionWaypoint();
+
+	//---------------------------------
+
+	float			GetPathLength();
+	float			GetPathDistanceToGoal( const Vector &);
+
+	float			GetStartTime() const	{ return m_routeStartTime; }
+
+	//---------------------------------
+	// How close do we need to get to the goal
+	//---------------------------------
+	void			SetGoalTolerance(float tolerance)	{ m_goalTolerance = tolerance;		}
+	float			GetGoalTolerance() const			{ return m_goalTolerance;			}
+
+	void			SetWaypointTolerance(float tolerance)	{ m_waypointTolerance = tolerance;  }
+	float			GetWaypointTolerance() const			{ return m_waypointTolerance;  }
+
+	//---------------------------------
+	// The activity to use during motion
+	//---------------------------------
+	Activity		GetMovementActivity() const					{ return m_activity;				}
+	Activity		SetMovementActivity(Activity activity);
+	int				GetMovementSequence() const 				{ return m_sequence;				}
+	int				SetMovementSequence(int sequence)			{ return (m_sequence = sequence);	}
+
+	Activity		GetArrivalActivity( ) const;
+	void			SetArrivalActivity(Activity activity);
+	int				GetArrivalSequence( ) const;
+	void			SetArrivalSequence(int sequence);
+
+	void			SetGoalDirection( const Vector &goalDirection );
+	void			SetGoalDirection( CBaseEntity *pTarget );
+	Vector			GetGoalDirection( const Vector &startPos );
+
+	void			SetGoalSpeed( float flSpeed );
+	void			SetGoalSpeed( CBaseEntity *pTarget );
+	float			GetGoalSpeed( const Vector &startPos );
+
+	void			SetGoalStoppingDistance( float flDistance );
+	float			GetGoalStoppingDistance( ) const;
+
+	//---------------------------------
+	// Target of this path
+	//---------------------------------
+	void			SetTarget(CBaseEntity * pTarget )	{ m_target = pTarget;				}
+	void			ClearTarget()						{ m_target = NULL; m_vecTargetOffset = vec3_origin;	}
+	void			SetTargetOffset( const Vector &vecOffset)	{ m_vecTargetOffset = vecOffset;	}
+	CBaseEntity *	GetTarget()							{ return m_target;					}
+
+	void			SetGoalType(GoalType_t goalType);				// Set the goal type
+	void			SetGoalPosition(const Vector &goalPos);			// Set the goal position
+	void			SetLastNodeAsGoal(bool bReset = false);			// Sets last node as goal and goal position
+	void			ResetGoalPosition(const Vector &goalPos);		// Reset the goal position
+
+	// Returns the *base* goal position (without the offset applied) 
+	const Vector&	BaseGoalPosition() const;
+
+	// Returns the *actual* goal position (with the offset applied)
+	const Vector &	ActualGoalPosition(void) const;			// Get the goal position
+
+	GoalType_t		GoalType(void) const;						// Get the goal type
+	
+	void			SetGoalFlags( unsigned flags )		{ m_goalFlags = flags;				}
+	unsigned		GoalFlags( void ) const;			// Get the goal flags
+
+	void			Advance( void );					// Advance to next waypoint if possible
+
+	bool			CurWaypointIsGoal(void) const;
+
+	void			Clear(void);
+
+	CAI_Path();
+	~CAI_Path();
+
+	//---------------------------------
+
+	int GetLastNodeReached() { return m_iLastNodeReached; }
+	void ClearWaypoints()
+	{ 
+		m_Waypoints.RemoveAll();
+		m_iLastNodeReached = NO_NODE;
+	}
+
+private:
+
+	// Computes the goal distance for each waypoint along the route
+	static void ComputeRouteGoalDistances(AI_Waypoint_t *pGoalWaypoint);
+
+	//---------------------------------
+	CAI_WaypointList m_Waypoints;
+
+	//---------------------------------
+	float		m_goalTolerance;			// How close do we need to get to the goal
+	Activity	m_activity;					// The activity to use during motion
+	int			m_sequence;					// The sequence to use during motion
+	EHANDLE		m_target;					// Target of this path
+	Vector		m_vecTargetOffset;			// offset from the target in world space
+	float		m_waypointTolerance;
+
+	//---------------------------------
+	Activity	m_arrivalActivity;
+	int			m_arrivalSequence;
+
+	//---------------------------------
+	int			m_iLastNodeReached;			// What was the last node that I reached
+
+	bool		m_bGoalPosSet;				// Was goal position set (used to check for errors)
+	Vector		m_goalPos;					// Our ultimate goal position
+
+	bool		m_bGoalTypeSet;				// Was goal position set (used to check for errors)
+	GoalType_t	m_goalType;					// Type of goal
+
+	unsigned	m_goalFlags;				// Goal flags
+
+	//---------------------------------
+	float		m_routeStartTime;
+
+	//---------------------------------
+	Vector		m_goalDirection;
+	EHANDLE		m_goalDirectionTarget;
+
+	float		m_goalSpeed;
+	EHANDLE		m_goalSpeedTarget;
+
+	float		m_goalStoppingDistance;		// Distance we want to stop before the goal
+
+	//---------------------------------
+	static AI_Waypoint_t gm_InvalidWaypoint;
+
+	DECLARE_SIMPLE_DATADESC();
+
+};
+
+#endif // AI_ROUTE_H