I did a little looking for the number of LEOs killed and how, here is what I found.
During 2007, for the 10th year in a row, more law enforcement officers died in traffic-related incidents than in shootings.
This is only auto or gun, more than this died each year.
2006 auto 74 shot 54
2007 auto 83 shot 68
2008 auto 71 shot 39
2009 auto 51 shot 49
2010 auto 72 shot 61
So it looks like they need to stop pulling people over on the side of the road so they will be safe.
All this can be found here.
National Law Enforcement Officers Memorial Fund: Latest Memorial Fund Research Bulletin
I don't agree with the interaction, but your statistic are misleading, because they don't tell the whole story.