Mark Brader wrote:

New Yorkers didn't
like it, and it was soon withdrawn.

1972 to 1979. The designer was Massimo Vignelli. In one important
respect this map out-Becked Beck: there were no diagonal lines.
Everything was drawn as either vertical or horizontal. Which meant
that in the more complex areas, a lot of lines had to zigzag to get
all the interchanges right.

In Beck's last maps used by LT, he was heading in the direction of no
diagonals.... I can't remember if he quite reached it.