Transportist

Share this post

Unifying Access

www.transportist.net

Discover more from Transportist

A newsletter on transport
Over 3,000 subscribers
Continue reading
Sign in

Unifying Access

David Levinson
May 6, 2020
Share this post

Unifying Access

www.transportist.net
Share

Recently published:

  • Wu, Hao and Levinson, D. (2020) Unifying Access. Transportation Research part D. Volume 83, June 2020, 102355 [doi][free until June 25]

Flowchart8

Since Hansen’s seminal 1959 paper, measures of access have evolved with technology and through practical applications. The myriad of distinct but familially related access measures created many more options to measure places, but has sown needless confusion. This paper systematically reviews measures of access across disciplines. We categorize measures of access, covering both mainstream and innovative but less widely-used techniques; each access measure (topological, contiguous, cumulative opportunities, utility, flow-based measures) is separated into Primal and Dual measure, based on whether accessibility is represented by the level of reachable opportunities or by the travel impedance. We show access measures are unified by the same intrinsic structure consisting of travel impedance and the opportunities reachable, and that access measured by different methods are equivalent under specific assumptions on travel impedance, and the accounting of relevant opportunities. This paper overviews the use of access measures from the existing literature, and clarifies measures of access, which should help users in the selection and appropriate use of access measures for the relevant context.

Share this post

Unifying Access

www.transportist.net
Share
Previous
Next
Comments
Top
New
Community

No posts

Ready for more?

© 2023 David Levinson
Privacy ∙ Terms ∙ Collection notice
Start WritingGet the app
Substack is the home for great writing