7. Toyota Avalon
Made in 1991
Cost Estimate: Not Known
The 1991 Toyota Avalon, a four-door convertible, was never put into production. It is understandable why this car never made it past the concept stage, given that the roof was intended to close entirely flat.
Toyota Avalon on Pinterest (@jrjones1956)
It is difficult to comprehend how seeing will function when the car’s roof is perfectly level with the trunk, even if visibility is rather vital while driving. Although it was created before the full-size Avalon, this vehicle is unrelated to it in terms of design or functionality.
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