I have been 100% car free now for 6 years and use a bicycle as my only mode of transit for getting to work and doing my shopping.

I worry about cars overtaking me quite often. Many seem to think just inches is plenty. Even though we have a 3-foot law here in Nebraska, you would be hard pressed to tell.

4 way intersections I simply avoid at any cost. nearly no motorist will yield the right of way here when it's your turn, after all it's just a bicycle. 2-way can be bad, but most of the time are ok.

as for running red light, there is NEVER an excuse. Even if you have to dismount and hit the pedestrian button that's what you do. IMHO any cyclist that runs a red light deserves a ticket. Even in the Netherlands running red lights is simply not accepted.