Gao, Yang and Levinson, D. (2022) A bifurcation of the peak: New patterns of traffic peaking during the COVID-19 era. Transportation. [doi]
This paper analyzes the emergence of two well-defined peaks during the morning peak period in the traffic flow diurnal curve. It selects six California cities as research targets, and uses California employment and household travel survey data to explain how and why this phenomenon has risen during the pandemic. The final result explains that the double-humped phenomenon results from the change in the composition of commuters during the morning peak period after the outbreak.
Lahoorpoor, B., Rayaprolu, H., Wu, H., and Levinson, D. (2022) Prioritizing Active Transport Network Investment using Locational Accessibility. TeMA – Journal of Land Use, Mobility and Environment. 15(2), 179-192. [doi]
This research explores prioritizing network investment to improve walking and biking access in a suburban area with a poorly connected street network. This study’s methods provide a systematic approach to design and prioritize the potential links to improve active travel in the suburban environment. An access-oriented ranking system is proposed to prioritize the contribution of links in two evaluation processes for different travel time thresholds. One of the developing suburbs in Sydney is selected as the case study, and a list of potential links is identified. Results indicate that links with the highest added access per unit of cost are the links that have the highest impact if all links are built. However, the locational network structure surrounding the point of interest may affect the order. For a radial network, closer links lead to higher access, while for a tree-like network structure, connecting branches improve access significantly. Also, farther potential links are significantly dependent on the closer links in increasing accessibility for a specific location. This suggests that in order to utilize the network, there should be a sequence in constructing the potential links. The application of access-oriented network investment is also discussed.