The Chi of Tsu and Shi

I sometimes see this kind of thing. Japanese words romanized with 

the variation. Older signs have this a lot, but this sign, fairly new

sports the 'alternate' spelling. 

Higashiguchi is the way one would pronounce this. Translated as East exit.

The Higashi 'romanized" spelling uses 'si' for "shi" and "ti" for "chi".  

Also, commonly misrepresented is the spelling of the sound 'tsu' （つ).