Kevin Leyden
@kleyden.bsky.social
It's all about urban liveability.
Why the negativity? Thought you'd would be supportive of the movement in NYC to address the high cost of housing.
November 5, 2025 at 6:25 AM
Why the negativity? Thought you'd would be supportive of the movement in NYC to address the high cost of housing.
1. Once the driver has reached a certain number of moving violations, their driver's license should be suspended.
2. Don't all these violations affect the driver's insurance rates?
2. Don't all these violations affect the driver's insurance rates?
October 16, 2025 at 4:49 AM
1. Once the driver has reached a certain number of moving violations, their driver's license should be suspended.
2. Don't all these violations affect the driver's insurance rates?
2. Don't all these violations affect the driver's insurance rates?
Reposted by Kevin Leyden
COVID-19 was a "black swan event" because it was unexpected and disruptive. It revealed hidden dynamics in traffic patterns, allowing the researchers to study cause & effect essentially as a Natural Experiment. The same conditions could not have been created deliberately.
www.bmj.com/content/388/...
www.bmj.com/content/388/...
Using natural experiments to evaluate population health and health system interventions: new framework for producers and users of evidence
Natural experiments are widely used to evaluate the impacts on health of changes in policies, infrastructure, and services. The UK Medical Research Council (MRC) and National Institute for Health and ...
www.bmj.com
June 26, 2025 at 9:44 AM
COVID-19 was a "black swan event" because it was unexpected and disruptive. It revealed hidden dynamics in traffic patterns, allowing the researchers to study cause & effect essentially as a Natural Experiment. The same conditions could not have been created deliberately.
www.bmj.com/content/388/...
www.bmj.com/content/388/...
Reposted by Kevin Leyden
The Shanghai study shows that congestion increases in a nonlinear way. A small rise in the number of vehicles can cause a big spike in delays & bottlenecks. This is because traffic jams often spread like a chain reaction, with one blockage triggering many others across the network. Intuitive, right?
June 26, 2025 at 9:47 AM
The Shanghai study shows that congestion increases in a nonlinear way. A small rise in the number of vehicles can cause a big spike in delays & bottlenecks. This is because traffic jams often spread like a chain reaction, with one blockage triggering many others across the network. Intuitive, right?