Massachusetts in 2008 had the lowest per capita traffic fatality rate of all the states. The first data point is the rate and the second data point is the rank. Wyoming had the highest mortality rate of the 50 states and D.C. Naturally, the use of mass transit, drive distances, speed limits, etc. would affect the statistics.
http://www-fars.nhtsa.dot.gov/States...llVictims.aspx
2008 Traffic Fatalities per 1000 People & State Rank
Wyoming 0.30 51
Mississippi 0.27 50
Montana 0.24 49
Arkansas 0.21 48
West Virginia 0.21 47
Alabama 0.21 46
Louisiana 0.21 45
Oklahoma 0.21 44
South Carolina 0.21 43
Kentucky 0.19 42
New Mexico 0.18 41
Maine 0.12 24
Vermont 0.12 23
New Hampshire 0.11 17
Connecticut 0.08 6
New Jersey 0.07 5
New York 0.06 4
Rhode Island 0.06 3
District of Col. 0.06 2
Massachusetts 0.06 1
USA 0.12