Delso, J.; Martín, B.; & Ortega, E. 2018.
Potentially Replaceable Car Trips: Assessment of Potential Modal Change towards Active Transport Modes in Vitoria-Gasteiz.
Road traffic is the most important contributor to noise and air pollutant emissions in cities. Its substitution by non-motorized modes therefore has great potential to improve the urban environment while increasing levels of physical activity among the population. This paper identifies car trips that could potentially be transferred to active modes such as walking and cycling, and analyses the barriers perceived by people who travel by car. We detect potentially replaceable car trips based on a mobility survey, distance calculation, and a distance threshold approach. The answers to a set of questions in the mobility survey allow us to identify the perceived barriers for use of the bicycle, applied to Vitoria-Gasteiz (Spain). The results show that between 30% and 40% of car trips could be replaced by active modes. Personal safety and distance results are the most limiting barriers perceived by car users, while physical condition and technique are the most limiting ones for bicycle users. These results provide valuable information for implementing measures to promote the replacement of motorized trips with walking and cycling.

 
 

Delso, J.; Martín, B.; Ortega, E.; Van de Weghe, N. 2019.
Individual and geographic variations in the propensity to travel by active modes in Vitoria-Gasteiz, Spain.
The transportation impacts of an increasingly urban population have led planners and policy makers to consider ways to encourage the use of active travel in urban areas. Active travel is attractive from a planning perspective because its environmental impact is considerably lower than the alternatives, and in addition is known to have a number of population health and social benefits. Not surprisingly, there has been a growth in interest in the factors associated with the use of active modes of transportation. The objective of this study is to investigate the individual (demographic and socio-economic) and contextual (geography and land use type) factors that correlate with the propensity to travel by active modes in Vitoria-Gasteiz. This is a medium sized city in the north of Spain, and a case study that has hitherto not been reported. Data obtained from a household travel survey (HTS) conducted in 2014 allow us to estimate a multinomial logit model of the propensity to travel by different modes of transportation. Furthermore, since the data are geocoded, we can estimate a model with spatially-varying coefficients to assess the geographical variations in the probability to use active modes. The results of the study provide valuable information concerning differences in active travel by gender and age, including significant and quite substantial variations by location. In addition, the effect of different urban fabrics indicates the relevance of density and mix of uses for active travel. In this way, the present research helps to increase our global knowledge-base regarding active travel in a medium-sized city.

 
 

Martín, B.; Páez, A. 2019.
Integrating pedestrian-habitat models and network kernel density estimations to measure street pedestrian suitability.
Pedestrian-oriented urban designs are sustainable from a mobility perspective, and could therefore be used to improve urban environments. This study proposes an analogy between the ecological idea of habitat and the pedestrian urban environment and introduces the concept of “pedestrian habitat quality”. We present a methodology based on this concept to measure pedestrian habitat suitability in an urban street network, combining network kernel density estimations with a habitat suitability model. The dimensions of proximity and walkability connectivity are first incorporated in the methodology through network kernel density estimations, and the micro physical environmental factors relevant for pedestrians are considered using a pedestrian habitat quality model. The final outcome of the methodology is an identification of priority streets for action in order to improve pedestrian mobility. The methodology was applied to Vitoria-Gasteiz, a medium-sized city in northern Spain. Our results for Vitoria-Gasteiz show that the streets with a greater potential for improvement are situated in the surroundings of the city centre and in industrial edges that serve as a link to residential zones. It has been demonstrated that the methodology could be a useful tool for urban and transport planners to identify priority streets on which to focus efforts for improving urban environments.