They are fairly common in japan. Since all most all of their cities over there have areas that are more tightly packed than NYC and LA.
In the US there isn't really a need for a turning ability that is that tight or the added complexity of a system that will most likely break down.
We keep our cars a lot longer than they do.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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