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Travel demand modeling remains a cornerstone of the transportation planning process. Although current transportation planning procedures are mostly performed by an interdisciplinary team approach, there are still a number of institutional issues which may hinder the process from providing the best results. According to Marshment (2001), the most notable setback is a lack of coordination between land use and transportation planning. Most of the time, land use plans do not reflect the influence of the accessibility to the alternative transportation facilities.

The lack of interaction between land use and transportation planning may play a major role in using unrealistic and unattainable land use and socioeconomic and demographic assumptions in the projection of future traffic levels with travel demand models. ... Robustness analysis can provide an approach to the structuring of transportation problems where uncertainty is high and where sequential, time-phased decision making is necessary.



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VDM Verlag Dr. Muller Aktiengesellschaft & Co., KG

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Saarbrucken, Germany