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I-690 New York
When the interchange with I-90 was moved 2 miles north in 1989, extending I-690, the exits were renumbered. 
When the "complicated" interchange with I-81 in Syracuse opened, brochures were mailed to all area residents on how to navigate it. 
Extending I-690 eastward?
The interchange with I-481 has some ramps not used for motorists (they currently provide access to a NYSDOT maintenance yard.) It makes you wonder: was there originally a plan to extend I-690 east of there?
As it turns out, there were at least three proposals, none of them approved. They include: 
I-690 has a traffic light that's activated during the 2-week New York State Fair to allow shuttle buses to cross from parking on the north side to the fairgrounds on the south.  (Contrary to previous information, pedestrians are not allowed to cross here.)