Safety concerns are the #1 reason I don't commute. This is 2 fold:

1. I work downtown. Utah drivers can be disrespectful enough when you are in a car, let alone a bike without a bike lane. I don't feel comfortable with the routes available to get to my office. Winter weather would only compound this.

2. Personal safety. Granted Salt Lake isn't nearly as dangerous as many big cities, I'm still leery of some areas.

Changing clothes, hair, etc. don't bother me. My bike could hang out in my cube all day. I don't have kids at the moment, so child care isn't a factor. It's exclusively safety.