According to Republic Act 5173, to ensure all safe passage of all vessels and watercrafts thru all navigable waters subject to the jurisdiction of the Philippines, the construction of all bridges over navigable waters has to be referred to the PCG for issuance of appropriate clearance, particularly confirming that the structure would not be hazardous to navigation. In addition to Republic Act 5173, the navigational span of the bridge should be provided in a way that it does not obstruct the safe navigation of appropriate vessels or watercraft passing through the area. Furthermore, Republic Act 5173 states that the installation and placement of all applicable navigational lights and markings in the navigable approaches of a road bridge, which is an inherent obligation of the constructor, have to be in conformity with the International Association of Lighthouse Authorities Buoyage System.
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