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| Symbol | Definition |
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| System cost |
| Acquisition cost of the sensor |
| Minimum system cost |
| Maximum system cost |
| Construction cost of the sensor |
| Maintenance cost for the sensor |
| a section |
| Set of sections in the road network, |
| Type of sensor |
| Set of common sensor types, |
| Set of OD pairs |
| Truncated flow |
| Maximum truncation flow |
| Maximum value of truncation flow |
| Set of |
| Optimal solution |
| Set of path |
| Number of paths contained in the section |
| Minimum path coverage |
| Traffic flow on path , which satisfies (8) |
| Traffic flow of section |
| Number of paths through the section |
| Unit price of sensor type , influenced by the market |
| Average life of sensor type |
| Average annual maintenance cost of sensor type |
| Level of reliability for obtaining traffic data for path , i.e., the probability that path traffic data will not be obtained |
| Threshold for the level of reliability |
| Level of reliability of obtaining traffic data of OD pairs |
| a failure of the sensor type of the section |
| Probability of failure of the sensor type on the section |
| Construction cost of the installation of sensor type in section |
| The number of sensors of type that need to be installed on the section |
| 1 if other systems have sensor type on section and 0 otherwise |
| 1 if urban traffic information collection system needs to arrange the sensor type in section and 0 otherwise |
| 1 if sensor type on section and 0 otherwise |
| 1 if section is on a certain path of the OD pair and 0 otherwise |
| 1 if section is on the route and 0 otherwise |
| 1 if a sensor on the path and 0 otherwise |
| 1 if a sensor on section and 0 otherwise |
| 1 if a failure of the sensor type on the section and 0 otherwise |
| 1 if traffic data for the path is available and 0 otherwise |
| Individual size, the number of elements in the set |
| Population size |
| Selection probability |
| Cross probability |
| Variation probability |
| Maximum number of evolutions |
| Tolerance factor for minimum system cost optimization |
| Tolerance factor for maximum truncation flow |
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