Several U.S. cities have used isochrones—lines that connect geographic points on a map to compare transit travel times—to redesign their transit systems. But the city of Richmond, Va., is using a new interactive tool that takes isochrone-informed transit planning to the next level.
As a design-build team of Lane Construction Corp. and STV Inc. nears completion of Pulse, a $65-million, 7.6-mile bus rapid-transit system, city officials commissioned Michael Baker International and Jarrett Walker & Associates to study how best to improve the existing bus system to maximize efficiency of service in conjunction with the new line.
Because it can moderate the damaging effects of earthquakes, base-isolation is a technique used primarily in seismically active regions. ENR takes a look at some of the largest applications of base-isolation technologies in the world.