Rear view problems
 

Many years ago a friend wanted to go to Bonneville and designed a car strictly for aerodynamics. It did not have a rear window so we got our heads together and came up with a periscope type device that actually worked very well...in theory. With outside-side mirrors and that periscope type mirror inside, one might be able to build a nice safe aero-body driver.

R. B. Fuller's Dymaxions used periscopes. The first one had a free-standing external mirror with flush viewports:

http://best-car-reviews.com/wp-conte...-6-626x382.jpg
http://best-car-reviews.com/wp-conte...-6-626x382.jpg

Later versions had a prismatic periscope in a blister:

https://lisawallerrogers.files.wordp...maxion-car.jpg
https://lisawallerrogers.files.wordp...maxion-car.jpg

The later version doesn't have the drag of the tubular stalk, but the free-standing mirror probably has a better view.

On the car in question, the body tapered down from the drivers area roof towards the rear. The mirror was basically a regular rearview mirror in looks inside, but was tilted to make the view go up to a second mirror facing to the rear outside. Rearward viewing was totally open without obstruction.

https://external-content.duckduckgo....jpg&f=1&nofb=1

The Lamborghini Countach was also planned to have a periscope. (In the sense that the rear view mirror looked above the roof.

The Arcimoto FUV, for example, has enough side taper that the 'door' mirrors both have visibility straight to the rear.

I find having two fish eye mirrors mounted where my sun visor is gives me a good view around, even with a Kammback .