非程序員改寫一把，請指教：

If [red light]
Then “stop at a marked limit line” (A，B)
If [an indication to proceed is shown]
Then
Go(A,B)；
else
if[no prohibiting a turn]
then Go(B)
Exception
If [pedestrians lawfully within an adjacent crosswalk]
Then
Yield (B)；
End If;


End If;
End If;

If [green light]
Then
If [pedestrians lawfully within an adjacent crosswalk]
Then
Yield(B)；
Else
Go (A)；
End if;
End If;