Over-Length Trucks?

When was each (US) State given the choice to permit overlength trucks? These trucks are two, full-sized trailers hooked together- as opposed to two, half-sized trailers hooked together as more commonly found.

The only place I have seen this is within NY. Do other states permit this? I assume these trailers in NY must stay within NY. Have other SDopers seen this? Is this a new idea? - Jinx

Here’s some more:
http://www.fmcsa.dot.gov/rulesregs/fmcsr/regs/658appnc.htm