Further to the Pass task (1.3P), Now consider modelling a system with two traffic lights controlling each direction of an intersection. Using the propositional variables {r1 , g1 , y1 , r2 , g2 , y2 }, write a single LTL formula that formalises the requirements that: Both traffic lights satisfy the conditions of the Pass task (1.3P); and It is always the case that at least one traffic light is red.

Further to the Pass task (1.3P), Now consider modelling a system with two traffic lights controlling each direction of an intersection. Using the propositional variables {r1,g1,y1,r2,g2,y2}, write a single LTL formula that formalises the requirements that: Both traffic lights satisfy the conditions of the Pass task (1.3P); and It is always the case that at least one traffic light is red