Daily entries from the 17th century London diary
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New Palace Yard was immediately to the north of Westminster Hall: http://www.pepysdiary.com/p/128.php
Old Palace Yard was to the south of the Hall. Latham & Matthews assume that when Pepys was ambiguous and referred to merely “Palace Yard” or “Palace,” he’s referring to New Palace Yard.
new palace yard had the world’s first traffic lights
However the world’s first automatic traffic lights could be seen in Princes Square, Wolverhampton in 1927.
The Crown was almost certainly in Old Palace Yard - it is refered to in a trial report of the theft of a silver tankard in 1683
http://www.oldbaileyonline.org/html_units/1680s/t16830418a-6.html
About the New Palace Yard
http://en.wikipedia.org/wiki/New_Palace_Yard
Map showing the New Palace Yard - lower center
http://www.motco.com/map/81002/SeriesSearchPlatesFullb.asp?mode=query&artist=384&other=361&x=11&y=11