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Fixing the Intersection of Broadway and City Road
Satellite Image of Improvement of Broadway - City Road Intersection
In the second half of 2017, I supervised a first year undergraduate student Tingsen Xian on an independent student project to redesign the intersection of Broadway and City Road in Sydney.
At one corner of this intersection is Victoria Park (lower left) and the University of Sydney (just off site), at another is the Broadway Shopping Center. This intersection has a high pedestrian count, high bus count, reasonably high car count, is very wide (befitting the name "Broadway"), and has long delays, especially for pedestrians. The proposed alternative removes the free left turn and porkchop island on the southwest corner, gives more space to pedestrians, buses (red), and bicyclists (green), and less space to cars, and the signal retiming reduces total person delay by 1.5% (a lot for pedestrians, while increasing it somewhat for car users), and sends the right incentives. The revised layout is shown in the image.
You can download the full report with more graphics, tables, and yes equations here: broadway-city-road.
[Obviously there are simplifying assumptions in any engineering analysis, and limited measurements and time to conduct the study, but I think the results are better than official results which don't consider pedestrian delay when timing intersections. It suggests professionals should be able to do a lot better than they have done here.]