Hi, I’m Mojtaba.
I’m a traffic engineer focused on operations, safety, and data-driven decision-making. I write about these topics in the Professional section, and explore ideas, learning, and perspectives beyond engineering in the Personal section. Visit the About Me page to learn more.
Latest Writing:
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History of Roundabouts, Part 3: From the Lab to the Street
Britain’s modern roundabout principles moved from controlled experiments to public roads through the development of mini-roundabouts. This part examines the early trials in Peterborough, Cardiff, and Hillingdon, including what they demonstrated about capacity, delay,…
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History of Roundabouts, Part 2: The Modern Roundabout Is Born
The modern roundabout emerged in Britain through more than a change in priority. This part examines Frank Blackmore’s research, the 1966 give-way rule, and the geometric changes that began controlling entry speed and vehicle…
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History of Roundabouts, Part 1: Before the Modern Roundabout
Roundabouts did not begin as the compact, yield-controlled intersections used today. Part 1 traces monumental circles, Columbus Circle, early one-way gyratory systems, and the large, high-speed rotaries that shaped public perceptions before the modern…