Modular railing for on-site construction

A modular railing system, configured to be assembled along a roadway, comprising:

• a deck having a slab surface that defines a deck level configured for incorporation into the roadway and an edge beam having a barrier wall rising from the deck level to an upper end that terminates in a mounting surface above the slab surface and roadway, the mounting surface comprising a longitudinal length between a first end and a second end of the deck that is non-horizontal, relative to the slab surface, the deck and the edge beam having an equivalent longitudinal length;
• and
• a concrete railing having an attachment surface that is complimentary with and fixable to the non-horizontal longitudinal length of the mounting surface, such that fixing the attachment surface to the mounting surface forms an immoveable joint above the deck level and roadway, and interlocking features on a first end of the railing and on a second end of the railing for interlocking two or more of the concrete railings above the immovable joint.