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+% SPEED(7ADVTRAINS) | Advtrains Developer's Manual
+
+# NAME
+`speed` - Advtrains speed limit library
+
+# DESCRIPTION
+The speed library allows the manipulation of speed limits, which can be represented with
+
+* A non-negative number, which stands for a regular speed limit in m/s, or
+* -1 or `nil`, which lifts the speed restriction
+
+The use of other values (in particular, nan and infinity) may result in undefined behavior.
+
+This library is available as `advtrains.speed`.
+
+# NOTES
+
+The meaning of `nil` for the speed limit library differs from its meaning in signal aspect tables, where `nil` keeps the current speed limit.