Abstract: A modular bridge comprising two end modules adapted for connection to respective end footings, a plurality of side railings adapted for modular interconnection in two parallel rows between the end modules, adjacent ones of the side railings being connected via interlocking splices, a plurality of floor beams arranged orthogonally between the two rows of side railings, and a structural connection for securing respective ones of the floor beams to corresponding ones of the side railings. The interlocking splices preferably each comprise a plurality of ribs disposed within respective ends of adjacent ones of the side railings for defining respective slots therebetween, a plurality of plates adapted for insertion into the respective slots, and apparatus for securing the plurality of plates within the respective slots.