Impact Of Built Environment On Residents’ Daily Activity Travel From The Perspective Of Life Cycle

With the rapid development of urban economy,problems such as traffic jam and traffic pollution caused by "sprawling" urban form are increasingly serious.The planning idea of optimizing urban space to guide residents’ traffic demand and travel mode selection has been strongly advocated,the relationship between built environment and travel behaviour has received long-term and extensive attention internationally by scholars.However,the previous research on individual daily activity scenarios is not enough,which may lead to differences in travel behaviour of groups with the same socioeconomic attributes or preferences.At the same time,family life cycle can reflect the changes of individual activity needs,preferences and socio-economic attributes by analyzing the changes of major events in individual life trajectory.With the change of life cycle,the factors that affect travel behaviour such as daily activity situation and preference of individuals may also change.If the impact of life cycle is not considered,the relationship between built environment and travel behaviour will be wrongly estimated.Therefore,it is necessary to re-evaluate the relationship between built environment and travel behaviour from the perspective of life cycle,including the impact of individual daily activities on the basis of existing built environment research framework.Firstly,the characteristics of built environment research in different periods were reviewed,and the shortcomings of previous research were summarized.Combined with life cycle theory and time geography,activity type,activity space and active sequence were regarded as the representative of individual daily activity context,and the research framework of environment and activity travel in the perspective of life cycle was proposed.Secondly,according to the daily travel survey data of residents in Kunming,the daily activities and preferences of different life cycle samples were analyzed and compared to verify the rationality of life cycle perspective.Based on the feature analysis and research framework,the individual daily activity context and built environment variables in different life cycle stages were modeled.Logistics regression was used to verify the impact of built environment on trips of different activity types.Intermediation model was used to verify the indirect impact of built environment on trips through activity space.The impact of built environment on trips of different active sequence was investigated by using the propensity matching score method.The conclusion shows that the life cycle will have an impact on the relationship between the built environment and individual daily activities.(1)there are differences in individual built environment of workplace,the built-up environment of residence and daily activity context in different life cycle stages.while there are great differences in daily activity context,built environment of residence and preference between parenting stage and other stages.(2)Travels of different activity types are not as sensitive to the built environment.For example,the individual work activity trips in the single stage are more sensitive to the built environment of the work place than other stages,and the individual work activity trips in the newlywed stage are more sensitive to the built environment of the residence.(3)The mediation effect and the adjustment effect of preference of activity space in different life cycle stages are different.The effect of built environment indirectly affects travel behaviour in single stage and newlywed stage by affecting activity space.The adjustment effect of preference on built environment and activity space is significant in parenting stage and education stage.(4)After controlling for the influence of related variables,compared with the built environment of workplace,the built-up environment of residence has more obvious influence on the travel of different sequence activity.These results can deepen our understanding of the relationship between the built environment,residents’ daily activity context and travel behaviour from the perspective of life cycle,provide a certain empirical basis for the development of urban transportation research,and provide more detailed guidance for transportation policy in practice.