Lewis Lehe

Lewis Lehe is a PhD student in Civil Engineering at the UC Berkeley, where he researches electronic road tolling and runs the VUDlab (Visualizing Urban Data Idealab). He also creates data visualizations under the brand “Setosa” at setosa.io.

What Are Traffic Waves and Why Do They Happen So Much?

Select a car from the bunch, click “Hit the Brakes” to slow it down and watch the traffic wave form. The red bars show deceleration levels (braking) and the green, acceleration (speeding up). Mouse over any car to see its velocity and acceleration at any given point during the wave (assuming all the cars are … Continue reading What Are Traffic Waves and Why Do They Happen So Much? →

America’s Confusing Patchwork of Abortion Laws: A Map of State Rules

On Thursday, the 42nd anniversary of the Supreme Court’s landmark Roe vs. Wade decision to legalize abortion nationwide, House Republicans had intended to vote on a proposal banning abortions at the 20-week post-conception period. But rather than approving the so-called “fetal pain” measure, the House swapped it for a watered down bill that would weaken insurance coverage … Continue reading America’s Confusing Patchwork of Abortion Laws: A Map of State Rules →

Forget Miles per Gallon! The Case for Switching to Gallons per Mile

To begin, a quiz: Bob and Jane Smith have two vehicles: One is a 15 MPG (miles per gallon) pickup truck that Bob uses for his construction job. The other is a 28 MPG sedan that his wife Jane uses for her work commute. The couple wants to upgrade to something more fuel efficient, but only has the cash … Continue reading Forget Miles per Gallon! The Case for Switching to Gallons per Mile →