Wearing a headset while you're in the car could obstruct your ability to hear a car that you didn't see in your blind spot...
About that blind spot hting. I don't have one in my car. I was watching a program several years ago, where an advanced driving instructor was giving advice to enhance driving control. Many of the things he was talking about I already knew, having had mandatory advanced driving training while in the Navy (it was for motorcycles and was mandatory to drive a bike on base, and many of the skills were applicable to cars). This instructor stated that there needn't be a blind spot when checking the mirrors and explained that most of us were taught improper merror alignment in driver's training while in high school. He stated that to prperly align the mirrors, the rear-view merror should show a clear view of the road directly behind the car. The driver-side mirror should show the road to the left, picking up the car comming up from behind just as it begins to leave the left side of the rear-view mirror, and continue to show that car until you can see it through your side window. The same is true of the passenger side mirror. It should pick up any cars in the lane just to your right as that car begins to leave the right side of the rear-view mirror.
To achieve this alignment, you place your left cheek against the driver-side window, and adjust the driver-side mirror until you can jsut see the side of your own car. Then, when you sit naturally, the mirror will be in the proper position. To adjust the passenger side mirror, you need the help of the passenger, unless you have electric mirrors. Then you adjust that mirror while driving until you get it adjusted properly.
I tried this technique and it works wonderfully well. I no longer have to spin my head around to check my blind spot. I never lose sight of any car behind me as it passes on either side. I have found that in some vehicles, you might have to make minor adjustments after aligning the mirrors with the "cheek against the window" technique. But it gets you in the ballpark.
My eldest son used to give me a bad time about how I adjusted my mirrors, stating that it wasn't how he was taught to do it in driver's training. And you know that parents always know less than any other living person in the eyes of a teenage boy. I finally stopped my car, on the street in front of my house and made him sit in the drivers seat. I had him adjust the mirrors how he thought they should be. I then walked from about 50 yards behind the car and as I got closer, moved to the left while still walking forward. I aproximated where the blind spot would be and had him watch the mirrors. We both agreed that there was a large blind spot. And he said that it was the reason you have to turn around and check the blind spot when changing lanes. I then had him adjust the mirrors by the tehcnique that I use and again walked from behind the car and to the left until I was adjacent to the driver side window. He followed me from the rear-view mirror into the side-view mirror, and could see me until I was right beside him. He was convinced that it was better. With this technique, you no longer have to turn around, taking your eyes from the road in front of you, where things can happen in a split second. You now only have to move your eyes, which is much quicker. Ane when you have to do things quickly, it can be the difference between avoiding an accident, and being in the six-o-clock news. I have avoided several accidents because of my mirror placement. It is a valuable technique, and is so easy to adjust to, unless you are my co-worker, or my boss, two very stubborn and never wrong individuals who refuse to learn anything new, especially from me.
Ok, I hope I was clear, and not too wordy.
Seeeeeya; Goodweed of the North