Why is it so hard for Baltimore to synchronize its traffic lights? Here’s what we found.

So why is it so hard to synchronize Baltimore’s traffic lights? It’s a perpetual question for drivers — and one that came up more in The Baltimore Sun’s reader-inspired series than almost any other. We asked city officials and outside experts to find out.

The red-light-green-light scenario Legler and Martin describe is a result of any number of factors, according to city transportation officials, including the time of day and the intersections in question, disruptions such as crashes and road closures, driver behavior, speed-calming measures — and, in particular, a lack of investment in Baltimore’s antiquated, 15-year-old network of traffic lights and traffic management technology.