When analyzing roads, intersections, and traffic flow, engineers face a common challenge: vehicles are not all the same. A car, a motorcycle, a truck, and a rickshaw each take up different amounts of road space, move at different speeds, and influence congestion differently. To solve this, transportation engineers use the Passenger Car Unit (PCU) — […]
When most people talk about rush hour traffic, they’re thinking about the frustrating congestion on roads during the morning and evening commute. Transportation engineers use a more technical term for the same idea: peak hour traffic. Understanding how traffic builds up during these busy times is crucial for designing roads, planning intersections, and evaluating new
If you already work with trip generation, you know the headline challenge in many Traffic Impact Studies (TIS/TIA): not all site trips are “new” to the network. Some are simply siphoned from vehicles already passing by. Getting this right can change turn lane warrants, signal timing, and mitigation costs. This guide is a practitioner’s deep-dive
