Review Article
A State-of-the-Art Review of the Sensor Location, Flow Observability, Estimation, and Prediction Problems in Traffic Networks
Table 1
Number of unknowns and equations or inequations of different systems of equations and associated ranks.
| | Equation | System | # of unknowns | # of equations or inequations | Rank () | | | | Lower bound | Upper bound |
| | | Equations | | (33) | Conservation equations | | — | — | | | | | (40) | Counting data | | — | — | | | | | (41) | Plate scanned data | — | — | | | | | | (33), (40), (41) | Conservation, counts, and plate scanned equations | | — | | | | | | (37) | OD-route flow relations | — | | | | | | | (37), (40), (41) | Conservation, counts, and plate scanned equations | | | | | | | | (39) | Route-link flow relations | | — | | | | | | (39), (40), (41) | Conservation, counts, and plate scanned equations | | — | | | | |
| | | Inequations | | (34) | Nonnegativity of link flows | | — | — | | — | — | | (35) | Link capacity constraints | | — | — | | — | — |
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