Kelcie Ralph, PhD

Associate Professor of Transportation Planning @blousteinschool. Videos on Transportation 101 here All views are my own.

[Kelcie Ralph, PhD @KMRalph]

New article alert!

Hot off the presses thanks to the hard work of @DrTaraGoddard @cgthigpen and @EvanIacobucci

We find that minor editorial changes in news coverage of traffic crashes affect how readers understand what happened and what they think we should do about it.

[Mark R. Brown, AICP, CNU @CompletedStreet]

I think about this graphic every time I cross a street in the U.S.

[Kelcie Ralph, PhD @KMRalph]

The full article is available open access in Nature Energy. https://t.co/auxJnQ9pdO

Here's the full table of policy levers they compared. Any of them would be an immense challenge to implement, but knowing the emission reduction sensitivity can help us make wise decisions.

[Kelcie Ralph, PhD @KMRalph]

Lesson 2: Long trips—which are extremely rare—contribute disproportionately to mileage and emissions.

[Kelcie Ralph, PhD @KMRalph]

Tackling emissions from air travel poses unique opportunities and challenges.

While miles flown continue to increase, flying remains highly unequal: ~20% of fliers in the UK take ¾ of all flights.

[Kelcie Ralph, PhD @KMRalph]

The team analyzed all trips across an entire year for residents of England.

Lesson 1: While short trips are common over the year, they contribute a small share of annual miles and emissions.

[Kelcie Ralph, PhD @KMRalph]

Folks who care deeply about reducing the environmental impact of travel should have new research from @jillian_anable, @ZiaWadud, and @DrAdeelM on their radar.

Punchline: long distance trips deserve greater attention in our carbon reduction efforts.

My graphical summary: 🧵

[Michael Smart @heyitsmikesmart]

Zero-car households often get around in cars--we investigated how they do that! Invisible Rides: Nicholas J. Klein, Anne Brown, Amanda Howell, Michael J. Smart, 2024 https://t.co/OeSMrf3u9m

[Kelcie Ralph, PhD @KMRalph]

Overall, people tend to treat driving and other activities very differently. Car brain at work! 🚗🧠

Link to article: https://t.co/1pwO9avOux

Congrats to @ianwalker, @AlanTapp, and Adrian Davis.

[Kelcie Ralph, PhD @KMRalph]

Do people have car brain? 🚗🧠

My graphical summary of @ianwalker and co.'s fantastic article.

A thread... 🧵

[Kelcie Ralph, PhD @KMRalph]

Car brain for bending the rules? Drivers v. Chefs

[Kelcie Ralph, PhD @KMRalph]

Full article: Whose Miles Are These Anyway?
Estimating Site-Generated Vehicle Miles Traveled

DOI: https://t.co/XvWbqftPuk

Congrats to @turleyvoulgaris, @greg_macfarlane, and Joseph Kaylor for this important work.

[Kelcie Ralph, PhD @KMRalph]

Many people think we should switch from using Trip Generation rates to estimating site-level Vehicle Miles Traveled (VMT). My brilliant friends @turleyvoulgaris @greg_macfarlane and Joseph Kaylor have a warning: estimating site-level VMT isn't as easy as it sounds.

[Kelcie Ralph, PhD @KMRalph]

Estimating daily VMT compounds uncertainty.