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A comparative assessment of edge-effect with syntax integration generated in axial and unit-segment approaches to modelling vehicular movement networks

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  • Abhijit Paul

Abstract

Unit-segment analysis - a recent development in space syntax - has shown better results in modelling vehicular movement networks than the traditional axial analysis merely by using configurational measures, integration results, of roadway segments of urban grids. Despite this advancement, some of the findings of the unit-segment model have remained controversial especially in the academic community. The concern of edge-effect is one of them. That is, at the practical level, how is it possible for a unit segment analysis to predict vehicular movement of a specified urban roadway grid with high accuracy when the analysis model does not consider trips that enter into the grid from outside? This paper throws a deeper insight into this question by evaluating the intensities of edge-effect generated by both the syntax models. By using the case of Tech Terrace, a residential neighbourhood of the city of Lubbock in West Texas, and then the city itself, the study produces extensive theoretical as well as empirical evidence showing that vehicular traffic predictions made by both the models are not free from edge-effect, but the generated effect in the unit-segment model is somewhat reduced than that of the axial counterpart. The findings also suggest that the problem of edge-effect is deep founded in the perception of network topology of an urban grid, and without understanding its role in assigning trips, brought from outside the grid into the grid itself, we indeed cannot understand the space syntax approach to modelling vehicular movement networks in a comprehensive way.

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  • Abhijit Paul, 2014. "A comparative assessment of edge-effect with syntax integration generated in axial and unit-segment approaches to modelling vehicular movement networks," International Journal of Urban Sciences, Taylor & Francis Journals, vol. 18(3), pages 340-354, November.
    • Handle: RePEc:taf:rjusxx:v:18:y:2014:i:3:p:340-354
    DOI: 10.1080/12265934.2014.908131
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    References listed on IDEAS

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    1. Abhijit Paul, 2013. "A syntactic approach to identifying land-use influence on vehicular movement: the case of Lubbock," International Journal of Urban Sciences, Taylor & Francis Journals, vol. 17(1), pages 71-84, March.
    2. A Penn & B Hillier & D Banister & J Xu, 1998. "Configurational Modelling of Urban Movement Networks," Environment and Planning B, , vol. 25(1), pages 59-84, February.
    3. B Hillier & A Penn & J Hanson & T Grajewski & J Xu, 1993. "Natural Movement: Or, Configuration and Attraction in Urban Pedestrian Movement," Environment and Planning B, , vol. 20(1), pages 29-66, February.
    4. Alasdair Turner, 2007. "From Axial to Road-Centre Lines: A New Representation for Space Syntax and a New Model of Route Choice for Transport Network Analysis," Environment and Planning B, , vol. 34(3), pages 539-555, June.
    5. Carlo Ratti, 2004. "Space Syntax: Some Inconsistencies," Environment and Planning B, , vol. 31(4), pages 487-499, August.
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