13.6.1 Overview
Unmet demand refers to the number of vehicles that were destined to travel through a network at a specific time period (e.g., signal phase, signal cycle, peak hour, etc.) but were unable due to capacity constraints. A visual representation of unmet demand is shown in .
The need to include unmet demand in an analysis is determined prior to model development, typically in the project scoping stage and data collection stage. The main components with unmet demand are:
- Determining locations that may have unmet demand;
- Estimating unmet demand; and
- Integrating unmet demand into a microsimulation model
Each of these steps is discussed below.
Figure 13-7: Graphical Depiction of Unmet Demand
Source: UDOT Traffic Analysis Guidelines