diff --git a/src/p_spec.cpp b/src/p_spec.cpp
index 2d7d3ddc0..e287ef047 100644
--- a/src/p_spec.cpp
+++ b/src/p_spec.cpp
@@ -242,6 +242,26 @@ bool P_ActivateLine (line_t *line, AActor *mo, int side, int activationType, DVe
 	return true;
 }
 
+DEFINE_ACTION_FUNCTION(_Line, Activate)
+{
+	PARAM_SELF_PROLOGUE(line_t);
+	PARAM_POINTER(mo, AActor);
+	PARAM_INT(side);
+	PARAM_INT(activationType);
+	PARAM_FLOAT_DEF(optx);
+	PARAM_FLOAT_DEF(opty);
+	PARAM_FLOAT_DEF(optz);
+	if ( optx == opty == optz == NAN )
+	{
+		ACTION_RETURN_BOOL(P_ActivateLine(self, mo, side, activationType, NULL));
+	}
+	else
+	{
+		DVector3 optpos = DVector3(optx, opty, optz);
+		ACTION_RETURN_BOOL(P_ActivateLine(self, mo, side, activationType, &optpos));
+	}
+}
+
 //============================================================================
 //
 // P_TestActivateLine
diff --git a/wadsrc/static/zscript/constants.txt b/wadsrc/static/zscript/constants.txt
index ef20e2310..fea498deb 100644
--- a/wadsrc/static/zscript/constants.txt
+++ b/wadsrc/static/zscript/constants.txt
@@ -1223,3 +1223,21 @@ enum ActorRenderFeatureFlag
 	RFF_VOXELS		= 1<<12, // renderer is capable of voxels
 };
 
+// Special activation types
+enum SPAC
+{
+	SPAC_Cross = 1<<0,		// when player crosses line
+	SPAC_Use = 1<<1,		// when player uses line
+	SPAC_MCross = 1<<2,		// when monster crosses line
+	SPAC_Impact = 1<<3,		// when projectile hits line
+	SPAC_Push = 1<<4,		// when player pushes line	
+	SPAC_PCross = 1<<5,		// when projectile crosses line
+	SPAC_UseThrough = 1<<6,	// when player uses line (doesn't block)
+	// SPAC_PTOUCH is mapped to SPAC_PCross|SPAC_Impact
+	SPAC_AnyCross = 1<<7,	// when anything without the MF2_TELEPORT flag crosses the line
+	SPAC_MUse = 1<<8,		// monsters can use
+	SPAC_MPush = 1<<9,		// monsters can push
+	SPAC_UseBack = 1<<10,	// Can be used from the backside
+
+	SPAC_PlayerActivate = (SPAC_Cross|SPAC_Use|SPAC_Impact|SPAC_Push|SPAC_AnyCross|SPAC_UseThrough|SPAC_UseBack),
+};
diff --git a/wadsrc/static/zscript/mapdata.txt b/wadsrc/static/zscript/mapdata.txt
index e219e835a..d7373d766 100644
--- a/wadsrc/static/zscript/mapdata.txt
+++ b/wadsrc/static/zscript/mapdata.txt
@@ -156,6 +156,7 @@ struct Line native play
 	native Line getPortalDestination();
 	native int getPortalAlignment();
 	native int Index();
+	native bool Activate(Actor activator, int side, int type, Vector3 pos = (double.nan, double.nan, double.nan));
 	
 	int GetUDMFInt(Name nm)
 	{