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18 lines
937 B
18 lines
937 B
\item \self
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Consider an ordinary traffic junction with incoming lanes from the north, south, east and west. We want to formulate relevant constraints that a traffic light system has to fulfill.
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Give a set of propositional variables that model whether the north and south \emph{or} the east and the west get the
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\begin{itemize}
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\itemsep0em
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\item green,
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\item yellow or
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\item red
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\end{itemize}
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light, respectively. \\
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Formulate the following sentences using \emph{$CTL^\star$}:
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\begin{enumerate}[label=(\alph*)]
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\item The north/south lanes will never get the green light at same time as the east/west lanes.
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\item Whenever the north/south lane receive the green light it will stay green until it changes to yellow.
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\item When the east/west lane has the red light, it will eventually get the yellow and red light until the light switches to green.
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\end{enumerate}
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