Ronald's main photographical project is the construction of a new subway line in Amsterdam, the North/Southline (Noord/Zuidlijn), which he is following since 2010 and will take some more years. The photos show an abstract as well as a technical point of view. However, the abstract way has become the focus.

There has been an exhibition in the Amsterdam City Hall of 24 large prints.

Exhibtions of the subway photo's and others of the portfolio  have been in Amsterdam:

Centrum voor Beeldende Kunst, Hogeschool van Amsterdam, Openbare Bibliotheek .