Add section on types of speed restriction.

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diff --git a/assets/manual2/manual.tex b/assets/manual2/manual.tex
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+++ b/assets/manual2/manual.tex
@@ -759,6 +759,26 @@ If you are stuck at some point or want something to compare your set up to, you
 \chapter{Signals}\label{s:signals}
 Signals are device that give trains certain instructions and/or imposes certain limitations on trains. Advtrains comes with a few signals, which will be explained in the corresponding sections.
 
+\section{Types of speed restrictions}
+There are a few types of speed restrictions that a signal can give. These speed restrictions are independent of each other, and the strictest restriction is chosen as the speed restriction of the train. The speed restrictions need to be set by the specific signs that do so - every signal can only set (and lift) one type of speed restriction and do not affect other speed restrictions. The naming of the speed restriction types are mainly aesthetic and does not give any particular information for advtrains - in real life, these are mainly informative for the driver.
+
+The following types of speed restrictions are used by signals in advtrains:
+
+\begin{description}
+\item[Permanent (\texttt{main}) speed restriction] The default type of speed restriction. This one is most commonly given by signal lights. This type of speed restriction may also be called the \textit{main speed restriction}.
+\item[Temporary (\texttt{temp}) speed restriction] Speed restrictions that are temporarily set up, such as near construction sites.
+\item[Line speed restriction] Speed restriction that applies to the entire rail line.
+\end{description}
+
+The following is an example of a train running with speed restrictions. You may want to read the section on German signal signs first.
+\begin{itemize}
+\item The train starts without any speed restriction.
+\item The train drives past a Lf 1/2 sign with a speed restriction of 8. The train now has a speed restriction of 8.
+\item The train drives past a Ks 1 with the Zs 3 indicator showing 12. The train now has a main speed restriction of 12 and a temporary speed restriction of 8, so the train still has a speed restriction of 8.
+\item The train drives past a Lf 3 sign. The temporary speed restriction is lifted, and the train now has a speed restriction of 12, set by the main speed restriction (described above).
+\item The train drives past a Zs 10 sign. The main speed restriction is lifted, and the train now has no speed restriction.
+\end{itemize}
+
 \section{Basic signals}
 
 The core mod of advtrains comes with wallmounted signals and a signal with two lights. These signals can only stop the train and lift the main speed restriction of the train.