We've never drawn up a policy, but I usually don't run siren on the interstate because no one else can hear it, and at that point it only interferes with in-cab conversation and radio communications. With the limited-access interstate, there is very little risk of cross-traffic (always allow the benefit of the doubt that some wacko in an ATV might cross the road!). As someone else mentioned earlier, however, I wouldn't hesitate to run up the siren to clear slower traffic or a mile or so out to announce our arrival to other companies/agencies already on scene. As long as I am close to traffic speed, all lights stay on. When not on the interstate, siren is on at all times in accordance with state law that says "all or nothing". We have a tanker, however, that has a bear of a time going up the mile-long grade just outside the fire station. Top speed is 25MPH up that hill (nowhere to gain momentum) and it is a 55MPH State Highway. Lights go off and people are allowed to pass as long as I am more than a mile or so from the scene, at least until I get back up to 45 or 50MPH.
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