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+% advtrains.speed.lessp(3advtrains) | Advtrains Developer's Manual
+
+# NAME
+`advtrains.speed.lessp`, `advtrains.speed.greaterp`, `advtrains.speed.not_lessp`, `advtrains.speed_not_greaterp`, `advtrains.speed.equalp`, `advtrains.speed.not_equalp`, `advtrains.speed.max`, `advtrains.speed.min` - speed restriction comparison functions
+
+# SYNOPSIS
+Each function takes two arguments and returns a boolean or (for `advtrains.speed.max` and `advtrains.speed.min`) a valid speed limit
+
+# DESCRIPTION
+
+The functions above correspond to the arithmetic `<`, `>`, `>=`, `<=`, `==`, `~=` operators and the `math.max` and `math.min` functions, respectively. The constants `nil` and `false` are treated as -1.
+
+# NOTES
+
+These functions are trivial to implement and the implementation can be easily embedded into existing code. They are simply provided for convenience.