J Michalek Profile picture
Dec 8 14 tweets 12 min read
We've been studying #traffic, #environment, #economic, #equity & #policy implications of #Uber & #Lyft in US cities for the past 6 yrs

Our new video & policy brief summarize what we found

🧵1/n


@CMUVEG @CMU_EPP @CMU_Mech @CMUEngineering #VEGFindings
Our new policy brief series on Transportation Network Companies (#TNCs) like #Uber & #Lyft has bottom-line findings on

1) Effects of Uber & Lyft Entry on US Cities
2) Traffic Implications
3) Environmental Implications
4) Equity Implications

🧵2/n

cmu.edu/traffic21/rese…
1) Effects of Uber & Lyft Entry on US Cities

Uber & Lyft affect different cities differently:
⬆️ vehicle ownership in car-dependent & slow growth cities
⬇️ transit ridership most in cities with higher income & fewer children

🧵3/n

cell.com/iscience/fullt…
In a working paper we find Uber & Lyft
⬆️ employment, especially for intermittent jobs
⬆️ wages for intermittent jobs &
⬆️ city GDP

🧵4/n

cmu.edu/traffic21/rese…
2) Traffic Implications of Uber & Lyft

Compared to a personal vehicle, Uber cleans the air but clogs streets
- TNC cars are newer & spend more time hot -> air pollution improves 9-13¢/trip
- But extra driving creates 45¢ of traffic & climate costs

🧵5/n

pubs.acs.org/doi/10.1021/ac…
Overall, you impose lower costs to society, on average, when you take your personal car

To reduce TNC trip costs to society, avoid displacing transit trips, and pool rides when you can

🧵6/n

pubs.acs.org/doi/10.1021/ac…
Chicago implemented a tax to encourage pooled rides & discourage travel to/from targeted zones during peak hours. We estimate it caused ⬆️ 3% pooling rates & ⬇️ 8% trips in targeted zones

🧵7/n

@cta
cmu.edu/traffic21/rese…
We simulate cost-minimizing TNC fleets
- Allowing ride pooling ⬇️external costs of congestion, collisions & emissions 8%
- When TNC pays external costs, pooling ⬆️3%, external costs ⬇️1% more
- Private costs alone provide most of incentive to pool

🧵8/n

cmu.edu/traffic21/rese…
3) Environmental Implications of Uber & Lyft

When faced with the costs their emissions impose on others, cost-minimizing TNCs electrify more of their fleets, ⬇️ air emission costs by 10% (NYC) to 22% (LA). Socially optimal fleet uses a mix of tech

🧵9/n

pubs.acs.org/doi/10.1021/ac…
4) Equity Implications of Uber & Lyft

During heat waves in NYC, TNC rides ⬆️ more in high-income neighborhoods than in low-income neighborhoods

🧵10/n

cmu.edu/traffic21/rese…
When COVID hit, ridership from high-income locations ⬇️ most. Perhaps low income riders had more essential jobs or fewer alternative options.

🧵11/n

cmu.edu/traffic21/rese…
Today’s TNCs may not ⬇️ pandemic deaths relative to buses, but autonomous TNCs would cut driver-passenger interactions & reduce spread

🧵12/n

cmu.edu/traffic21/rese…
Authors include @DocCHarper @DestenieNock @MatthewBruchon @CostaSamaras @jha_economics @inesliaz @MahtotSselassie @lilyrhanig @alehenao10 Daniel Armanios, Connor Forsythe, Adam Koling, Jake Ward, Kate Whitefoot, et al. An outstanding group I am so lucky to work with!

🧵13/n

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with J Michalek

J Michalek Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @JJMichalek

Jan 6, 2021
Hot off the press:

Q: What changes when Uber and Lyft enter US cities?
A: Depends on the type of city.

Thread: 1/8

cell.com/iscience/fullt… @CostaSamaras @inesliaz @alehenao10 @CMUVEG @CMU_EPP #VEGFindings Image
@CostaSamaras @inesliaz @alehenao10 @CMUVEG @CMU_EPP In our new paper in @iScience_CP, we leverage the fact that Uber/Lyft entered 224 US cities by 2017 with staggered timing to isolate changes caused by Uber/Lyft from other changes over time and other differences among cities. 2/8 Image
@CostaSamaras @inesliaz @alehenao10 @CMUVEG @CMU_EPP @iScience_CP On average, people buy *more* cars when Uber/Lyft arrive, especially in car-dependent and slow-growth cities, like St. Louis, Pittsburgh and Cincinnati. 3/8 Image
Read 9 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us on Twitter!

:(