Continuing an old theme, but this time with some actual numbers, via Nature:
114 deaths per million people occurred in road crashes in 29 countries in the developed world during 2001.
0.293 deaths per million people were caused by terrorism each year in the same countries in 1994–2003.
390:1 is the ratio of road deaths to deaths from terrorism.
Source: N. Wilson and G. Thomson Injury Prevention 11, 332–333 (2005).
And if I didn't mention it before, I'm currently in Dunedin because of this.