As the Dublin is moving forward towards a brighter future on the bases of three main pillars: reducing car dependency, improving the public transport, and most importantly achieving those goals in sustainable environmentally friendly approaches, it implies that major changes to current existing travel behavior are on the way. Moreover, it is always healthy to remember that not only the proposal of many projects is vital but the ability to coordinate their planning, evaluate their potential impacts, assess their actual influence, and utilize the available feedback loops to ensure the most appropriate results the public seeks. Given the serious deficiencies that conventional four-step travel demand modeling approach, therefore, it is the time to invest towards developing a new tool that can facilitate the transformation that Dublin and Ireland are looking after with a development of an activity-based travel demand model that has the potential to be the suitable candidate for answering ‘what if’ answers.