Your health at risk

As per usual I am in search of more professionally collected research material. I happened across this on:

http://journals.lww.com/epidem/Abstract/2009/03000/Long_Term_Exposure_to_Road_Traffic_Noise_and.20.aspx

As you read this abstract, be sure to remember that the Cedar Leq was in excess of 70... So, people who live around loud traffic are more likely to have myocardial infarction... heart attacks.

Does this make our project a public health issue? There are an awful lot of people that live on or near Cedar.

So here is my smart ass question of the day: Would people concerned about slow ambulance response time due to backed up traffic have to worry as much (because they might be less at risk for a heart attack) if the traffic was quieter?
also:
Does this mean that a better designed road would actually improve the health of the people living on or near it? It's an interesting thought.