I recently spent several days in the heart of Washington DC. As I walked to and from the NCTM conference, to restaurants and museums, I watched the seconds tick down on the walk/don't walk clocks at each street corner. The time allotted for pedestrians to cross ranged from 12 seconds at one corner to 60 seconds at another.
I pondered the wide range of times. They weren't related to the width of the street or the average number of people standing there (some corners, especially around Chinatown, were definitely busier than others). Instead, the signals were timed to accommodate the vehicle traffic whizzing through the green lights that corresponded with the walk signals. (more…)
