He is commonly seen in buildings in Hong Kong, often in the form of a niche with incense down at sidewalk level.  Furthermore, his role at crossings makes me think of the Japanese custom of placing Jizo Bosatsu (Ksitigarbha Bodhisattva, whose name means "Earth Store"), at crossroads.

The Tu Di for any given place provides protection for the residents, and is thus often associated with police and other protective services.  He is approached for any matters, public or private, that require supernatural intervention.  (Stevens points out that if the matter is private, it will only be discussed with the ancestors in one's ancestral hall.)  He is also addressed regarding boundaries, and the erection or destruction of buildings.  Furthermore, when one moves, one bids farewell to the Tu Di of the old place, and begins presenting offerings to the Tu Di of the new place.

Finally, like so many other Chinese gods, he plays a role in bringing prosperity, so he is sometimes seen holding a golkd ingot, as in the image below.

In 100 Chinese Gods, Lu Yanguang notes Tu Di's great humility (not surprising, as he is close to the earth).  He tells a story from the Ming Dynasty (by one Yang Ling) that, "traveling incognito," Emperor Taizu and a companion entered a crowded restaurant.  Finding no table, the emperor respectfully removed the Fu De tablet from the altar and used it horizontally as a dining table.  After the emperor left, his companion, a scholar, re-placed the tablet.  That night, the scholar had a dream in which Fu De said, "The emperor has ordered me not to sit on the altar table."  Thereafter, he has (usually) been found at floor- or graound-level.

His holidays include his birthday on the second day of the second lunar month, and the Mid-Autumn Festival, when he inspects the fields.