Safety and posted speed limits are often not super compatible; the <i>safest</i> thing, in most road conditions, is to be driving relatively close to the speed of the surrounding traffic, even if that means exceeding the posted speed limit.<p>(in other words, speed itself is not dangerous except in certain situations -- like sharp curves or wet&#x2F;snowy&#x2F;icy roads -- speed <i>differential</i> is dangerous)