Safe Transportation Research & Education Center

Being a public resource, the roadway space was distributed between different road users based on the Passenger-Car-Unit (PCU) concept. However, this concept tends to under estimate the capacity of public transportation and non-motorized travel. To improve the traditional car-oriented design to become more human-oriented, this study proposed a Passing-passenger-unit (PPU) and the method to observe the PPU in roadway level and area level. The PPU data were collected for urban arterials and residential areas in China to test the method and to compare the right-of-way distribution at different types of locations. Results showed that the PPU revealed the true efficiency of the facility carrying passengers. Using PPU would tell a different story about the facility or system compared to using PCU. Additionally, using PPU to analyze the right-of-way for the roadway or community could offer guidance for improving pedestrian and bicyclist environment.