With my job I get to drive tradesmen and other peoples cars/work utes/ vans a lot.
Its a eye opener when you hop in the drivers seat, then go to reverse, either a cab has been installed on a work ute, which is full of tools or your looking through three window panes to get a glimse out the back in your internal rear view mirror.
Most older vehicles don't have reversing mirrors.
A lot private cars now have their windows tinted (not from factory though...thank goodness)
Some bigger vehicles have sign written wraps over the windows.
If a customer asks to have the back window sign written, I mention that they won't be able to use there rear windscreen wiper.
The reply is that they never use it anyway and they will most likely take it off.
So its alarming as a motorcyclist how people will place priority on privacy (driver passenger tinted windows) signwritten windows, over the importance of having a clear view all the way around there vehicles when driving to avoid accident.
At least im not totally ignorant to the fact that people drive around oblivious to what is going on behind them.
As for improving visibility for myself as a motorcyclist, if I really wanted to I would bombard the ministry of transport Government deptartment to ban tinted and sign written windows of all vehicles.
My mirrors on the r1200r are very good, alot of my riding is on dual lane highways.
If I do get to ride on four lanes, I look in my mirrors, then make sure I've room between me and the vehicle in front and quickly do a head check, before moving into the other lane.
Some times by the time you have head checked, and looked to the front you can be approaching fast, a braking car in front of you. ...yikes.