After working undercover and spending hours in a car for surveillance, I discovered that if you place those small, concaved mirrors on your outside rearview mirrors you can effectively eliminate the blind spot while parked. We spend hours in our patrol vehicles writing reports. I always try to find a safe spot where no one can approach, but I have been contacted too many times by citizens who walked up through my blind spot.
Do not use the round type but rather use the rectangular type. They go on a particular way depending if it’s the driver’s side or the passenger side and they don’t block your existing mirror. The mirror is only 2 inches by 1 inch. They also come in handy when you want to make a lane change. A quick glance can tell you if there is a vehicle there or not.