Which is more dangerous: Combat in Iraq or US traffic?

Each year more people are killed in US traffic accidents than killed in the entire Iraq war effort.  How many more?  A lot more.  These statistics don’t lie:

American deaths in Iraq since the war began:
4217+

Traffic fatalities in US for 2006 – one year (not including pedestrians):
36,000+

Sources:
http://www.antiwar.com/casualties/
http://www-nrd.nhtsa.dot.gov/Pubs/810791.PDF