diff --git a/examples/station_berg.tex b/examples/station_berg.tex
index 50795b1..39589ef 100644
--- a/examples/station_berg.tex
+++ b/examples/station_berg.tex
@@ -27,9 +27,9 @@
   {   % tracks
     \draw[MainTrack] ( 1.5, 0) -- ++(37,0);
     \draw[MainTrack] (15  , 0) -- ++( 1,1) -- ++(10,0) -- ++(1,-1);
-    \draw[SideTrack] (11  ,-1) -- ++( 2,0) -- ++( 1,1);
-    \draw[SideTrack] ( 9  , 1) -- ++( 7,0);
-    \draw[SideTrack] (14  , 1) -- ++( 1,1) -- ++(10,0);
+    \draw[SecondaryTrack] (11  ,-1) -- ++( 2,0) -- ++( 1,1);
+    \draw[SecondaryTrack] ( 9  , 1) -- ++( 7,0);
+    \draw[SecondaryTrack] (14  , 1) -- ++( 1,1) -- ++(10,0);
     % track numbers
     \node[fill=background] at (11.7, 1) {12};
     \node[fill=background] at (11.7,-1) {10};
diff --git a/examples/station_chamstadt.tex b/examples/station_chamstadt.tex
index 81af5cd..0d23e31 100644
--- a/examples/station_chamstadt.tex
+++ b/examples/station_chamstadt.tex
@@ -31,7 +31,7 @@
     \draw[MainTrack] (14  , 0) -- ++( 1,-1) -- ++(10.5,0) -- ++( 1,1);
     \draw[MainTrack] (27  , 1) -- ++( 1,-1);
     \draw[MainTrack] (29  , 0) -- ++( 5, 5);
-    \draw[SideTrack] ( 9  , 1) -- ++( 7, 0);
+    \draw[SecondaryTrack] ( 9  , 1) -- ++( 7, 0);
     % % track numbers
     \node[fill=background] at (12.5, 1) {11};
     \node[fill=background] at (21.75, 1) { 1};
diff --git a/examples/station_okerbach.tikz b/examples/station_okerbach.tikz
index ff6f67d..7d9be19 100644
--- a/examples/station_okerbach.tikz
+++ b/examples/station_okerbach.tikz
@@ -25,15 +25,15 @@
   \draw[MainTrack] (O2R-2) --   (O2S-2); % track 2
   \draw[MainTrack] ( 5, 1) -- ++( 1,-1); % track W1/W2
   \draw[MainTrack] ( 7, 0) -- ++( 1, 1); % track W3/W4
-  \draw[SideTrack] ( 7, 2) -- ++(-3, 3) -- ++(-0.5,0); % track 132
+  \draw[SecondaryTrack] ( 7, 2) -- ++(-3, 3) -- ++(-0.5,0); % track 132
   \draw[MainTrack] ( 8, 0) -- ++( 1,-1) -- ++(13. ,0) -- ++( 1. , 1); % track 10
   \draw[MainTrack] ( 9, 1) -- ++( 1, 1) -- ++(11. ,0) -- ++( 1. ,-1); % track 13
-  \draw[SideTrack] (10, 2) -- ++(-4, 0) -- ++(-2. ,2) -- ++(-0.5, 0); % track 131
+  \draw[SecondaryTrack] (10, 2) -- ++(-4, 0) -- ++(-2. ,2) -- ++(-0.5, 0); % track 131
   \draw[MainTrack] (10, 2) -- ++( 1, 1) -- ++( 9. ,0) -- ++( 1. ,-1); % track 14
-  \draw[SideTrack] (11, 3) -- ++( 1, 1) -- ++( 7. ,0) -- ++( 1. ,-1); % track 15
-  \draw[SideTrack] (19, 4) -- ++( 4, 0); % track 215
+  \draw[SecondaryTrack] (11, 3) -- ++( 1, 1) -- ++( 7. ,0) -- ++( 1. ,-1); % track 15
+  \draw[SecondaryTrack] (19, 4) -- ++( 4, 0); % track 215
   \draw[MainTrack] (23, 1) -- ++( 1,-1); % track W16/W18
-  \draw[SideTrack] (32, 0) -- ++( 1.5,-1.5) -- ++( 4, 0); % track 410
+  \draw[SecondaryTrack] (32, 0) -- ++( 1.5,-1.5) -- ++( 4, 0); % track 410
   \draw[MainTrack] (35, 0) -- ++( 1, 1); % track W21/W22
 }
 { %% track numbers
diff --git a/examples/station_pockelsdorf.tikz b/examples/station_pockelsdorf.tikz
index 0fd4ae1..992082a 100644
--- a/examples/station_pockelsdorf.tikz
+++ b/examples/station_pockelsdorf.tikz
@@ -22,7 +22,7 @@
   \draw[MainTrack] ( 5,0) -- ++(1,1) -- ++(14,0) -- ++(1,-1); % track 2
   \draw[MainTrack] ( 7,1) -- ++(1,1) -- ++(11,0) -- ++(1,-1); % track 3
   \draw[MainTrack] ( P2M) -- ++(5,5);
-  \draw[SideTrack] (22,0) -- ++(1.5,-1.5) -- ++(3,0); % track 10
+  \draw[SecondaryTrack] (22,0) -- ++(1.5,-1.5) -- ++(3,0); % track 10
 }
 { %% track numbers
   \node[fill=background] at (13.5, 0) { 1};
diff --git a/examples/station_rebenau.tikz b/examples/station_rebenau.tikz
index 85c784d..fe7cfa3 100644
--- a/examples/station_rebenau.tikz
+++ b/examples/station_rebenau.tikz
@@ -23,15 +23,15 @@
   \draw[MainTrack] (R2W-1) --   (R2O-1); % track 1
   \draw[MainTrack] ( 5, 0) -- ++( 1, 1);
   \draw[MainTrack] (R2W-2) -- ++( 8, 0) -- ++(2,2) -- ++(26,0) -- ++(2,-2) -- (R2O-2);  % track 3
-  \draw[SideTrack] ( 9, 1) -- ++( 6, 0); % track 21
-  \draw[SideTrack] ( 8, 4) -- ++( 7, 0); % track 41
-  \draw[SideTrack] (12, 4) -- ++( 1,-1);
+  \draw[SecondaryTrack] ( 9, 1) -- ++( 6, 0); % track 21
+  \draw[SecondaryTrack] ( 8, 4) -- ++( 7, 0); % track 41
+  \draw[SecondaryTrack] (12, 4) -- ++( 1,-1);
   \draw[MainTrack] (14, 3) --   (15, 4) --   (R2P);   % track 4
   \draw[MainTrack] (14, 0) -- ++( 1, 1) -- ++(18, 0); % track 2
   \draw[MainTrack] (15, 3) -- ++( 2,-2);
   \draw[MainTrack] (16, 4) --   (17, 5) --   (29, 5) -- ++(5,-5); % track 5
   \draw[MainTrack] (28, 1) -- ++( 1, 1) -- ++( 5, 0) -- ++(2, 2);
-  \draw[SideTrack] (26, 5) -- ++( 1, 1) -- ++( 3, 0);  % track 51
+  \draw[SecondaryTrack] (26, 5) -- ++( 1, 1) -- ++( 3, 0);  % track 51
 }
 { %% track numbers
   \node[fill=background] at ( 9.0, 4) {41};
diff --git a/examples/station_schleinitz.tikz b/examples/station_schleinitz.tikz
index 5a690cb..f917862 100644
--- a/examples/station_schleinitz.tikz
+++ b/examples/station_schleinitz.tikz
@@ -27,11 +27,11 @@
   \draw[MainTrack] ( 5, 0) -- ++(  1, 1); % track W2/W3
   \draw[MainTrack] (16, 1) -- ++(  1,-1); % track W4/W5
   \draw[MainTrack] (18, 0) -- ++(  1, 1); % track W6/W7
-  \draw[SideTrack] (23, 2) -- ++( -5, 0); % track 41
+  \draw[SecondaryTrack] (23, 2) -- ++( -5, 0); % track 41
   \draw[MainTrack] (22, 0) -- ++(  1,-1) -- ++(13. ,0) -- ++( 1. , 1); % track 1
   \draw[MainTrack] (22, 1) -- ++(  1, 1) -- ++(13. ,0) -- ++( 1. ,-1); % track 4
-  \draw[SideTrack] (24, 2) -- ++(  1, 1) -- ++(10. ,0) -- ++( 1. ,-1); % track 5
-  \draw[SideTrack] (36,-1) -- ++(  5, 0); % track 11
+  \draw[SecondaryTrack] (24, 2) -- ++(  1, 1) -- ++(10. ,0) -- ++( 1. ,-1); % track 5
+  \draw[SecondaryTrack] (36,-1) -- ++(  5, 0); % track 11
   \draw[MainTrack] (38, 1) -- ++(  1,-1); % track W18/W19
 }
 { %% track numbers
diff --git a/snippets.pdf b/snippets.pdf
index 2ee52ad..dea8774 100644
Binary files a/snippets.pdf and b/snippets.pdf differ
diff --git a/snippets.tex b/snippets.tex
index 25d730d..dfe7aae 100644
--- a/snippets.tex
+++ b/snippets.tex
@@ -50,7 +50,7 @@
     \hline
       \No & track distance (in \si{\metre}) & \symbol{track_distance.tikz}                        & \code{track_distance.tikz}                        & \texttt{topology}       \\
     \hline
-      \No & side track                      & \symbol{side_track.tikz}                            & \code{side_track.tikz}                            & \texttt{topology}       \\
+      \No & secondary track                 & \symbol{secondary_track.tikz}                       & \code{secondary_track.tikz}                       & \texttt{topology}       \\
     \hline
       \No & track number                    & \symbol{track_number.tikz}                          & \code{track_number.tikz}                          & \texttt{topology}       \\
     \hline
diff --git a/snippets/bufferstop_backward.tikz b/snippets/bufferstop_backward.tikz
index a674823..7baec64 100644
--- a/snippets/bufferstop_backward.tikz
+++ b/snippets/bufferstop_backward.tikz
@@ -4,5 +4,5 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (0,0) -- ++(2.5,0);
+\draw[SecondaryTrack] (0,0) -- ++(2.5,0);
 \pic at (0,0) {bufferstop_backward};
\ No newline at end of file
diff --git a/snippets/bufferstop_forward.tikz b/snippets/bufferstop_forward.tikz
index b3a3bda..12c3641 100644
--- a/snippets/bufferstop_forward.tikz
+++ b/snippets/bufferstop_forward.tikz
@@ -4,5 +4,5 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(2.5,0);
+\draw[SecondaryTrack] (-2.5,0) -- ++(2.5,0);
 \pic at (0,0) {bufferstop_forward};
\ No newline at end of file
diff --git a/snippets/combined_signal_forward.tikz b/snippets/combined_signal_forward.tikz
index 2e3f54d..a9c041e 100644
--- a/snippets/combined_signal_forward.tikz
+++ b/snippets/combined_signal_forward.tikz
@@ -5,5 +5,6 @@
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
 \draw[MainTrack] (-2.5,0) -- ++(5,0);
-\pic at (0,0) {block_signal_forward};
-\pic at (0,0) {distant_signal_forward};
\ No newline at end of file
+\pic at (0,0) {block_signal_forward={S}}; % Order 1
+% replace the S with desired speed or remove
+\pic at (0,0) {distant_signal_forward};   % Order 2
\ No newline at end of file
diff --git a/snippets/derailer_left_backward.tikz b/snippets/derailer_left_backward.tikz
index 43a1b25..925b6cb 100644
--- a/snippets/derailer_left_backward.tikz
+++ b/snippets/derailer_left_backward.tikz
@@ -4,5 +4,5 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(5,0);
+\draw[SecondaryTrack] (-2.5,0) -- ++(5,0);
 \pic at (0,0) {derailer_left_backward};
\ No newline at end of file
diff --git a/snippets/derailer_left_forward.tikz b/snippets/derailer_left_forward.tikz
index fbb6610..b3c0aac 100644
--- a/snippets/derailer_left_forward.tikz
+++ b/snippets/derailer_left_forward.tikz
@@ -4,5 +4,5 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(5,0);
+\draw[SecondaryTrack] (-2.5,0) -- ++(5,0);
 \pic at (0,0) {derailer_left_forward};
\ No newline at end of file
diff --git a/snippets/derailer_right_backward.tikz b/snippets/derailer_right_backward.tikz
index 0bfacaf..db9f4ae 100644
--- a/snippets/derailer_right_backward.tikz
+++ b/snippets/derailer_right_backward.tikz
@@ -4,5 +4,5 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(5,0);
+\draw[SecondaryTrack] (-2.5,0) -- ++(5,0);
 \pic at (0,0) {derailer_right_backward};
\ No newline at end of file
diff --git a/snippets/derailer_right_forward.tikz b/snippets/derailer_right_forward.tikz
index 3600219..3cd482f 100644
--- a/snippets/derailer_right_forward.tikz
+++ b/snippets/derailer_right_forward.tikz
@@ -4,5 +4,5 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(5,0);
+\draw[SecondaryTrack] (-2.5,0) -- ++(5,0);
 \pic at (0,0) {derailer_right_forward};
\ No newline at end of file
diff --git a/snippets/hump.tikz b/snippets/hump.tikz
index b2a508a..cbcea3e 100755
--- a/snippets/hump.tikz
+++ b/snippets/hump.tikz
@@ -4,5 +4,5 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(5,0);
+\draw[SecondaryTrack] (-2.5,0) -- ++(5,0);
 \pic at (0,0) {hump};
\ No newline at end of file
diff --git a/snippets/side_track.tikz b/snippets/secondary_track.tikz
similarity index 88%
rename from snippets/side_track.tikz
rename to snippets/secondary_track.tikz
index 679a49c..72be7c3 100644
--- a/snippets/side_track.tikz
+++ b/snippets/secondary_track.tikz
@@ -4,4 +4,4 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(5,0);
\ No newline at end of file
+\draw[SecondaryTrack] (-2.5,0) -- ++(5,0);
\ No newline at end of file
diff --git a/snippets/vehicle.tikz b/snippets/vehicle.tikz
index fae0bf7..1d8ea8f 100644
--- a/snippets/vehicle.tikz
+++ b/snippets/vehicle.tikz
@@ -4,6 +4,6 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(5,0);
+\draw[SecondaryTrack] (-2.5,0) -- ++(5,0);
 \pic at (-0.5,0) {vehicles=1};
 % change the 1 to desired length
\ No newline at end of file
diff --git a/snippets/vehicles.tikz b/snippets/vehicles.tikz
index 7ba2d94..411c50e 100644
--- a/snippets/vehicles.tikz
+++ b/snippets/vehicles.tikz
@@ -4,5 +4,5 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(5,0);
+\draw[SecondaryTrack] (-2.5,0) -- ++(5,0);
 \pic at (-2,0) {vehicles};
\ No newline at end of file
diff --git a/snippets/vehicles_with_label.tikz b/snippets/vehicles_with_label.tikz
index 2c57998..81f0834 100644
--- a/snippets/vehicles_with_label.tikz
+++ b/snippets/vehicles_with_label.tikz
@@ -4,6 +4,6 @@
 % Copyright 2019 Martin Scheidt (ISC license)
 % Permission to use, copy, modify, and/or distribute this file for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 
-\draw[SideTrack] (-2.5,0) -- ++(5,0);
+\draw[SecondaryTrack] (-2.5,0) -- ++(5,0);
 \pic at (-2,0) {vehicles};
 \node[font=\sffamily] at (0,0) {label};
\ No newline at end of file
diff --git a/src/tikzlibrarytrackschematic.topology.code.tex b/src/tikzlibrarytrackschematic.topology.code.tex
index 95601d6..d2cec05 100644
--- a/src/tikzlibrarytrackschematic.topology.code.tex
+++ b/src/tikzlibrarytrackschematic.topology.code.tex
@@ -10,7 +10,7 @@
 \colorlet{foreground}{black}
 
 \tikzset{MainTrack/.style={line width=2pt,foreground}}%
-\tikzset{SideTrack/.style={line width=0.7pt,foreground}}%
+\tikzset{SecondaryTrack/.style={line width=0.7pt,foreground}}%
 
 \tikzset{
   pics/track_number/.default=,
diff --git a/src/tikzlibrarytrackschematic.trafficcontrol.code.tex b/src/tikzlibrarytrackschematic.trafficcontrol.code.tex
index 69b78b7..52577c4 100644
--- a/src/tikzlibrarytrackschematic.trafficcontrol.code.tex
+++ b/src/tikzlibrarytrackschematic.trafficcontrol.code.tex
@@ -349,4 +349,40 @@
   },
 }
 
+\tikzset{
+  opposing_protection_forward/.pic={
+    \path[draw=foreground, fill=background] (-0.175,-0.15) -- ++(0,0.3) -- ++ (0.35,-0.15) -- cycle;
+  };
+}
+
+\tikzset{
+  opposing_protection_backward/.pic={
+    \path[draw=foreground, fill=background] (0.175,-0.15) -- ++(0,0.3) -- ++ (-0.35,-0.15) -- cycle;
+  };
+}
+
+\tikzset{
+  opposing_protection_granted_forward/.pic={
+    \fill[foreground] (-0.175,-0.15) -- ++(0,0.3) -- ++ (0.35,-0.15) -- cycle;
+  };
+}
+
+\tikzset{
+  opposing_protection_granted_backward/.pic={
+    \fill[foreground] (0.175,-0.15) -- ++(0,0.3) -- ++ (-0.35,-0.15) -- cycle;
+  };
+}
+
+\tikzset{
+  opposing_protection_declined_forward/.pic={
+    \path[draw=foreground, fill=background, densely dotted] (-0.175,-0.15) -- ++(0,0.3) -- ++ (0.35,-0.15) -- cycle;
+  };
+}
+
+\tikzset{
+  opposing_protection_declined_backward/.pic={
+    \path[draw=foreground, fill=background, densely dotted] (0.175,-0.15) -- ++(0,0.3) -- ++ (-0.35,-0.15) -- cycle;
+  };
+}
+
 \endinput
diff --git a/symbology.pdf b/symbology.pdf
index bb9575a..5e2701c 100644
Binary files a/symbology.pdf and b/symbology.pdf differ
diff --git a/symbology.tex b/symbology.tex
index c340c30..a3f58f8 100644
--- a/symbology.tex
+++ b/symbology.tex
@@ -48,7 +48,7 @@
     \hline
       \No & track distance (in \si{\metre}) & \symbol{track_distance.tikz}                        \\
     \hline
-      \No & side track                      & \symbol{side_track.tikz}                            \\
+      \No & secondary track                 & \symbol{secondary_track.tikz}                       \\
     \hline
       \No & track number                    & \symbol{track_number.tikz}                          \\
     \hline
@@ -122,7 +122,8 @@
     \hline
       \No & transmitter bidirectional       & \symbol{transmitter_below_bidirectional.tikz}       \\
     \hline
-      \No & block end marker                & \symbol{block_end_marker_forward.tikz}              \\
+      \No & \parbox[c]{4cm}{block end marker\\(end of movement authority)}
+                                            & \symbol{block_end_marker_forward.tikz}              \\
     \hline
       \No & block clearing point            & \symbol{block_clearing_point_forward.tikz}          \\
     \hline