Get more out of BTR
Find out more about BTR
Take part in one of our fiendishly tricky three-minute quizzes
Subaru B11S
The B11S was effectively Subaru's take on the Mazda RX-8 – but it never saw production
Isdera Commendatore 112i
The Isdera Commendatore 112i was meant to go into production, but just one was built
Zagato Zele
The Zele was out of character for Zagato, but this tiny commuter car saved its maker
Ferrari P80/C
Ferrari has built quite a few one-offs for special clients, but just one track-only car so far
Julien MM5
Maurice Julien's microcars were better developed than many, but they still bombed
Atlas Babycar
This French microcar disappeared from view almost as quickly as it arrived
Opel Maxx
In the mid-1990s, the Maxx was GM's vision of the future of urban motoring
Smart ForSpeed
Smart created an electric sequel to its bonkers Crossblade, which sadly remained a one-off