Detroit – The city's fire brigade no longer uses lights and sirens in all its runs, prompting the fire-union to warn that the new policy could endanger lives.

But Detroit Fire Brigade says he has no plans to fall back on a strategy that offers discretion to dispatchers, firefighters and EMTs to warn those on the road to "easy", which means that they have their lights and sirens can turn off to arrive safely.

Detroit Fire Commissioner Eric Jones told The Detroit News Monday that ignoring traffic lights and speed limits by activating lights and sirens for every single run – even when it is not urgent – is unnecessarily dangerous.

The policy, which began last month and applies to all firefighters and those who drive firefighting vehicles, classifies runs with two codes: one for upcoming runs and the other for non-life threatening calls.