By Speece

The term "By Speece" appears to be a reference to the Speece model (or Speece equation) used in traffic flow theory and highway capacity analysis. The Speece model is an empirical mathematical model that describes the relationship between traffic flow (vehicles per hour), density (vehicles per mile), and speed (miles per hour) on a roadway. It's a fundamental concept utilized in transportation engineering for predicting and analyzing traffic congestion.

The Speece model, like other traffic flow models (Greenshields, Greenberg), provides a way to estimate traffic speed and flow based on the density of vehicles on a road segment. It assumes a specific functional form for the speed-density relationship, allowing traffic engineers to make predictions about traffic performance under varying traffic conditions.

The specific equation and parameters of the Speece model may vary depending on the road type, location, and other factors. Calibration and validation using real-world traffic data are crucial to ensure the model's accuracy for a particular roadway. The model is used in conjunction with other traffic engineering principles and tools to design and manage roadways effectively.