Sinkhole in Chicago neighborhood swallowed three cars this morning. As usual, this one was caused by a water main break. The water eroded the soil and rock under the road, creating a void and ultimate collapse. We’ll hear a lot more of these incidences in the coming years. America’s infrastructure is in rough shape, and water, sewer, and gas lines average close to 50 years old. Replacements costs are extremely high - most cities wait for a break to happen before replacing pipes, which is more expensive and dangerous over time. But, cities around the country are deferring maintenance due to a dwindling tax base. Via NBC.