The only feature I seem to be able to identify, that enables a TT and Motor Vehicle to be very loosely compared, is that a Rotating Circular form is a critical part to be used for it to function of the Two very different functions offer by each.
There are other less exotic forms of producing a means to transport that could be compared to a TT, especially when used in a very loose comparison like has been above, such as a wheel barrow, I can't inform if such exclusive Brands are available as listed above.
The Linn would surely be best compared to an Electric Powered Vehicle known as the Scamp, that was a design born around the same time the technology that Linn adopted was being produced.
With the correct marketing approach, the Scamp might have become more successful in sales numbers than any of the above mentioned vehicles.