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+---
+title: 'SIGNAL_ASPECTS(7ADVTRAINS) | Advtrains Developer''s Manual'
+seealso:
+- speed(7advtrains)
+---
+
+# NAME
+`signal_aspects` - Signal aspect tables for Advtrains
+
+# DESCRIPTION
+A signal aspect table describes the status of a signal in relation to a train following it.
+
+A signal aspect table may contain the following fields:
+
+* `main`: The main aspect of the signal
+* `type`: The type of speed restriction imposed by the main aspect
+* `dst`: The distant aspect of the signal
+* `shunt`: A boolean indicating whether shunting is allowed
+* `proceed_as_main`: A boolean indicating whether a train in shunt mode should continue with shunt mode disabled
+
+The `main` and `dst` fields may contain
+
+* A non-negative number indicating the current or next speed limit
+* -1, indicating that the speed limit is or will be lifted
+* `nil`, indicating that the speed limit is or will not be changed