speed limit Insurance Institute for Highway Safety Car accidents report traffic deaths recent... Insurance Institute for Highway Safety recent... Insurance Institute for Highway Safety Insurance Institute for Highway Safety Insurance Institute for Highway Safety speed limits Insurance Institute for Highway Safety IIHS study claims April 2016 report Insurance Institute for Highway Safety http://www.iihs.org 2016 publication IIHS http://www.iihs.org maximum speed limits IIHS study recent study maximum speed limits speed limit Higher speed limits cause more fatalities study by the Insurance Institute for Highway Safety ample evidence IIHS studies speed limit increases increase speed limits texting and driving Speed limit increases cause 33,000 deaths in 20 years