My apartment is relatively quiet, except for traffic noise, as I live along a pretty busy street. What are some steps I can take to reduce the noise of cars constantly going up and down my street? I can't do anything to the windows, as I am renting. However, are there any special types of curtains, for example, that I can hang to reduce the noise? I feel like there must be some people on letsrun who have some sound engineering backgrounds or who live along busy streets & can offer some insight into dealing with this issue. Thanks, in advance, for your feedback!