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