code/__DEFINES/dcs/signals/signals_shuttle.dm 
COMSIG_SHUTTLE_SHOULD_MOVE | Called when the shuttle tries to move. Do not return anything to continue with default behaviour (always allow) : () |
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BLOCK_SHUTTLE_MOVE | Return this when the shuttle move should be blocked. |
Define Details
BLOCK_SHUTTLE_MOVE 
Return this when the shuttle move should be blocked.
COMSIG_SHUTTLE_SHOULD_MOVE 
Called when the shuttle tries to move. Do not return anything to continue with default behaviour (always allow) : ()