To efficiently utilise limited urban space, it is essential to integrate and duplicate the existing facilities. Transportation facilities may be combined with commercial or office spaces and adding supplementary functions while maintaining the original purpose of the transportation facilities, will improve convenience for users and residents in the vicinity. In cases of redevelopment that spans multiple areas, a road network layout considering the existing roads is necessary.

It is important to conduct a careful review of the internal road configuration during the development planning process to minimise inconvenience to residents who previously used the roads that may be removed during redevelopment. When seeking to remove the existing transportation facilities, clear criteria need to be established, and the decision should be supported with evidence. When transportation impact assessments require preserving the existing roads, there are several options to consider.

It is also worth considering the preservation of urban planning facilities through legal means or dividing and utilising surface and underground spaces through duplication and complexation. Moreover, essential roads can be designated as shared roads for both pedestrians and vehicles. It is essential to establish appropriate administrative procedures and definitions.