in other words, there's two pieces here, 1) the rule, 2) the consequences of breaking the rule.
It is agreed that the rule (1) is broken by emergency vehicles. It is unknown that (2) is in effect (it is not described in the scenario), but people would assume that there's no consequences for emergency vehicles breaking the rule.
It is agreed that the rule (1) is broken by emergency vehicles. It is unknown that (2) is in effect (it is not described in the scenario), but people would assume that there's no consequences for emergency vehicles breaking the rule.