After proving its robo-taxis are 90% safer than human drivers, Waymo is now making them more "confidently assertive" to better navigate real-world traffic. This counter-intuitive shift from passive safety to calculated aggression is a necessary step to improve efficiency and reduce delays, highlighting the trade-offs required for autonomous vehicle integration.

A 1969 UC Berkeley study by Donald Appleyard revealed a direct correlation between car traffic and social isolation. Residents on streets with heavy traffic reported almost no interaction with neighbors, while those on light-traffic streets had significantly more friends and acquaintances, quantifying how cars erode community.

A study found that children who travel mostly by car draw simplistic, danger-focused "cognitive maps" of their surroundings. In contrast, kids in walkable areas create highly detailed maps with more streets, houses, and play locations, indicating a richer environmental understanding and greater independence.

A company's monopoly power can be measured not just by its pricing power, but by the 'noneconomic costs' it imposes on society. Dominant platforms can ignore negative externalities, like their product's impact on teen mental health, because their market position insulates them from accountability and user churn.

Unlike a solid speed bump, a 'speed cushion' is a traffic calming device with wheel-wide gaps. This simple design innovation effectively slows down standard cars while allowing wider-axle vehicles like ambulances and fire trucks to pass through without slowing down, prioritizing emergency response.

The principles influencing shoppers are not limited to retail; they are universal behavioral nudges. These same tactics are applied in diverse fields like public health (default organ donation), finance (apps gamifying saving), and even urban planning (painting eyes on bins to reduce littering), proving their broad applicability to human behavior.

Starbucks' delivery revenue hit $1B, driven by larger order sizes. With a 40% food "attachment rate," customers add items like egg wraps to their coffee order to justify the delivery fee, a behavior akin to filling a shopping cart on fast-fashion sites to unlock free shipping.

The success of services like Uber isn't just about saving time; it's about the *perception* of convenience and control. A user might wait longer for an Uber than it would take to hail a cab, but the feeling of control from ordering on an app is so powerful that it overrides the actual loss of time. This psychological element is key.

Legally mandated parking spaces for every new building add tens of thousands of dollars to construction costs and raise rents. These laws also make it impossible to reuse older, historic buildings that can't accommodate parking, fundamentally forcing modern architecture to be designed around cars.