5. Data Requirements
ICM data requirements are provided in Table 5.1, which defines the information needed to perform the desired ICMS functions. The data requirements specify the source of the data, the frequency of the data, the characteristics of the data and the method a data is produced. Note that the data are referenced in the functional requirements.
| ID | Data Element Name | Source of data | Unit | Frequency of data from source | Characteristics, such as accuracy, validity, timing, and capacity | Calculation or algorithm used to derive data value |
|---|---|---|---|---|---|---|
| DF | Freeway data | |||||
| DF-01 | Freeway travel time | 511 | Minutes | Every 30 seconds | Error less than 20% of total travel time | Derived |
| DF-02 | Freeway travel speed | Freeway TMS and PeMS | miles/hour | Every 0.5 mile | Errors of 5 mph or less | Both Direct measurement and filtered data using PeMS |
| DF-03 | Freeway traffic volume | Freeway TMS and PeMS | Vehicle/lane/hour | 30 seconds | Errors less than 20% of the total count | Calculated |
| DF-04 | Freeway Occupancy | Freeway TMS and PeMS | Every 0.5 mile | Errors less than 20% of the total count | Calculated | |
| DF-05 | Freeway traffic sensor status | Freeway TMS and PeMS | Functional/nonfunctional | Every 0.5 mile | Detectable for 90% of the sensors | Calculated |
| DF-06 | Freeway ramp volume | Freeway TMS and PeMS | Vehicle/lane/hour | At freeway on- ramp | Error less than 20% of total count or less. | Calculated |
| DF-07 | Freeway ramp sensor status Freeway | Freeway TMS and PeMS | Functional/Nonfunctional | Every 0.5 mile | Detectable for 90% of the sensors | Calculated |
| DF-08 | Current condition of freeway operations system | Freeway TMS | Functional/Nonfunctional | Every 60 second | Can detect 100% system failures that cause interruption of system operation | Calculated |
| DF-09 | Current messages on variable message signs | Freeway TMS | Functional/Nonfunctional | Every 60 second | Can detect power related CMS failures | Processed |
| DA | Arterial data | |||||
| DA-01 | Arterial presence traffic volume | Caltrans, cities, ACCMA | Vehicle counts | Every 60 second | Error less than 20% of the total count | Derived |
| DA-02 | Arterial advance traffic volume | Caltrans, cities, ACCMA | Vehicle counts | Every 60 second | Error less than 20% of the total count | Derived |
| DA-03 | Arterial traffic signal status | Caltrans, cities | none | Every 60 second | Cycle splits and offsets and whether the signal is operational, with latency of no more than 20 s | Derived |
| DT | Transit data | |||||
| DT-01a | Transit bus location | AC Transit CAD AVL | GPS coordinates | Every 120 seconds from AC Transit CAD/AVL | Within GPS error (~15 meters) | Derived |
| DT-01a | Transit bus location | ICM Data acquisition system | GPS coordinates | Every 2 seconds from ICM data logging system | Within GPS error (~15 meters) | Derived |
| DT-02 | Transit bus time to arrival at next bus station | Next Bus | Minute | Every 60 seconds | 20% of the time to arrival | Calculation |
| DT-03 | Transit bus ridership data | AC Transit CAS AVL | Rider | Every 120 seconds | Less than 10% of the total measured ridership | Derived |
| DT-04 | BART train location | BART CTC | km/mile from a reference location | Every 2 seconds | Error less than 10% of the distance traveled | Calculated |
| DT-05 | BART train time-to-arrival at the next station | BART ATC | Minute | Every 30 seconds or less | Error less than 10% of the time to arrival | Calculated |
| DT-06 | BART ridership | Fare collection system Rider | Minute | Every entry | Error less than 1% of the total riders | Derived |
| DT-07 | Parking availability at major parking facilities | BART parking management system | Space | Every 60 seconds | Error less than 1% | Derived |
| DI | Incident data | |||||
| DI-01 | Freeway incidents | Caltrans, CHP | None | Less than 5 minutes after incident occurs | Location, type of incidents, Validated report | Reporting |
| DI-02 | Arterial and local incidents | Caltrans, cities, ACCMA | None | Less than 5 minutes after incident occurs | Location, type of incidents, Validated report | Reporting |
| DI-03 | Transit incidents | AC Transit, BART | None | Less than 5 minutes after incident occurs | Location, type of incidents, Validated report | Reporting |
| DI-05 | Natural disasters | USGS through stakeholders agencies | None | Forecast if possible; reports less than 10 minutes after the disaster occurs | Location, disaster type (e.g., earthquake, flood), Validated report | Reporting |
| DI-06 | Damaged infrastructure | Caltrans, cities, BART | Infrastructure name, location | Immediately | No later than one hour after damage occurs | Reporting |
| DI-07 | Planned road closure | Caltrans, cities, BART | Infrastructure name, location | After road closure plans are developed | 90% correct for 24 hours notice | Derived |
| DI-08 | Maintenance and construction schedule | Caltrans, cities, BART | Location and time | After maintenance schedule are developed | 90% correct for 24 hours notice | Derived |
| DI-09 | Condition of emergency response | CHP, police, fire | None | During the emergency response | Delay no longer than 5 minutes | Derived |
| DPF | Processed data- Freeway | |||||
| DPF-01 | Freeway travel time advisory | CHP, police, 911 | Minutes | Update every 30 seconds | Error less than 20% | Processed |
| DPA | Processed data- Arterial | |||||
| RPA-01 | Arterial travel time advisory | CHP, police, 911 | Minutes | Update every 30 seconds | Error less than 20% | Processed |
| Processed data- Transit | ||||||
| DPT-01 | Bus Time-to- Arrival | AC Transit, 511 | Minutes | Update every 30 seconds | Error less than 10% of time to arrival | Processed |
| DPT-02 | Bus trip time estimate info | AC Transit, 511 | Minutes | Every 60 seconds | Error less than 10% of time to arrival | Processed |
| DPT-03 | BART Time-to-Arrival | BART, 511 | Minutes | Every 60 seconds | Error less than 10% of time to arrival | Processed |
| DPT-04 | BART trip time estimate info. | BART, 511 | Minutes | Every 60 seconds | Error less than 10% of time to arrival | Processed |
| DPT-05 | Transit connection info | AC Transit, BART, 511 | Minutes | Every seconds | Error less than 10% of time to arrival | Processed |
| DPR | Processed data- Route selection | |||||
| DPR-01 | Alternative route travel time info | Caltrans | Minutes | Update every 60 seconds | Error less than 20% of time to arrival | Processed |
| DPR-02 | Alternative route advice | 511, Caltrans | Highway number | Update every 60 seconds | Alternative route | Processed |
| DPR-04 | Travel time about alternative route | 511, Caltrans | Minutes | Update every 60 seconds | Error less than 20% of total travel time | Processed |
| DPR-03 | Parking availability info | BART | number of parking space | Update every 60 seconds | Error less than 1% of the total parking space | Processed |
| DPI | Processed data- Incidents | |||||
| DPI-01 | Highway incident location | 511, CHP, Caltrans | location | Update every 60 seconds | Within 60 seconds of receiving an inquiry | Processed |
| DPI-02 | Highway incident severity | 511, CHP, Caltrans | Level (1-5) | Update every 60 seconds | Within 60 seconds of receiving an inquiry | Processed |
| DPI-03 | Duration of incident | 511, CHP, Caltrans | Minutes | Update every 60 seconds | Within 60 seconds of receiving an inquiry | Processed |
| DPI-04 | Transit incident | BART, AC Transit | Minutes | Update every 60 seconds | Within 60 seconds of receiving an inquiry | Processed |
| DPI-05 | Traffic condition near incidents | 511, Caltrans, ACCMA | Level (1-5) | Update every 60 seconds | 300 seconds after incident occurs | Processed or Inputted |
| DPI-06 | Congestion location | 511, Caltrans, ACCMA | Location | Update every 60 seconds | 300 seconds after incident occurs | Processed |
| DPI-07 | Speed slowdown location | 511, Caltrans, ACCMA | mph or kph | Update every 60 seconds | 300 seconds after incident occurs | Processed |
| DPCM | Processed data – construction and maintenance | |||||
| DPCM-01 | Construction and repair work info | Caltrans, cities, BART | None | Once | Location and time (minutes) Within 60 seconds of receiving an inquiry |
Processed |
| DPSE | Processed data - Special event | |||||
| DPSE-01 | Estimate attendance of special event | Oakland Coliseum | People, vehicles | Once | 5 hours prior to the event | Processed |
| DPSE-02 | Traffic impact info | Caltrans, 511 | Minutes, for travel time delay | Once | 2 hours prior to the event | Processed |
| DPSE-03 | Connection protection recommendations | AC Transit, BART | None | Every 120 seconds | The error of predicted arrival is less than 2 minutes | Processed |
| DPER | Processed data – emergency response | |||||
| DPER-01 | Best route recommendation for emergency vehicles | 511 | None | Upon Request | Graphic and descriptive | Processed |
| DPER-02 | Maintenance and construction schedule info | Caltrans, cities and transit agencies | None | Hourly | Schedule may change but will be updated | Developed by related agencies |
| DPPO | Processed data -- Port operation | |||||
| DPPO-01 | Port access delay info | Port of Oakland | Minute | 60 seconds | Error less than 15 minutes | Processed |