Transport projects, particularly those that embrace sustainable mobility, can be game changers towards creating environmentally and socially friendly mobility networks. Despite aspiring to reduce mobility gaps, pitfalls in project design could lead to increased equity and accessibility distribution concerns. This study aims at providing a methodology to estimate the potential accessibility and consider equity effects of potential large-scale mobility infrastructure projects. The proposed method relies on spatial analysis and welfare economics and allows the comparison of multiple scenarios. Focusing on the metropolitan area of Athens, Greece, as the case study the method is applied to investigate and compare the impacts of three different alternative infrastructure projects to the existing fixed-route public transport system. Various public transport and cycling projects are evaluated: a) operation of a new metro line, b) development of a new metropolitan cycling network, and c) addition of both a new metro line and a metropolitan cycling network. The method advances the existing accessibility literature by incorporating and highlighting safety concerns in measuring accessibility. Unsafe links (no cycle lane, mixed traffic) are dilated whereas safe links are contracted (cycle lane), taking into account the Value-of-Safety (VoS). The study has significant policy and research implications as it offers a scalable framework for the evaluation of transport projects via the lens of fair and equity mobility networks.