My article “Off the Grid… and Back Again? The Recent Evolution of American Street Network Planning and Design” has been published by the Journal of the American Planning Association and won the 2020 Stough-Johansson Springer Award for best paper. It identifies recent nationwide trends in American street network design, measuring how urban planners abandoned the grid and embraced sprawl over the 20th century, but since 2000 these trends have rebounded, shifting back toward historical design patterns.
This study measures the entropy (or disordered-ness) of street bearings in each street network, along with each city’s typical street segment length, average circuity, average node degree, and the network’s proportions of four-way intersections and dead-ends. It also develops a new indicator of orientation-order that quantifies how a city’s street network follows the geometric ordering logic of a single grid. These indicators, taken in concert, reveal the extent and nuance of the grid.
I’m a historian of innovation. I write mostly about the causes of Britain’s Industrial Revolution, focusing on the lives of the individual innovators who made it happen. I’m interested in everything from the exploits of sixteenth-century alchemists to the schemes of Victorian engineers. My research explores why they became innovators, and the institutions they created to promote innovation even further.
To truly increase innovation, I think we need policies focused on what goes on even further upstream, before much of the supply of new inventors is inevitably siphoned off into distractions, dead ends, and failure. Most policies inevitably have a marginal effect, but a slight expansion of the incoming swell of potential inventors can have a much greater impact than fiddling with the incentives of the few hundred who’ve already somewhat made it to the final trickle. Increase the strength of the flow upstream, and everything downstream flows the faster too.