Origin-Destination (OD) studies are used to determine travel patterns of traffic in an area of interest for a period of time. By setting up a network of SMATS Bluetooth and Wi-Fi sensors around the OD points of interest, iNode uses MAC address tracking and matching to determine individual trip patterns and the origin-destination matrix. The combination of Bluetooth and Wi-Fi detections also improves the sample size of the data, which is an important factor in OD studies.
Sensor Selection #
Nodes: Origin (entry) and destination (exit) points which form the OD matrix. A trip starts from an Origin and ends at a Destination sensor.
Include: Sensors that should be optionally included in the list of trips between nodes. These are the waypoints between an origin and a destination point.
Must Include: The sensor(s) that must always present in the list of the trips.
Must Exclude: The sensor(s) used to exclude the trips including this sensor.
Time and Date Selection #
Select days and hours for OD analysis. Multiple days and time slices can be selected. Multiple days selection are aggregated and the generated reports are reported separately for each time slice such as AM and PM peaks.
Advanced Settings #
Min. Cross Sensor Detection Interval (seconds): If sensors are installed close to each other, there might be some overlap detection zones between the 2 sensors. This parameter is used to avoid trip list bouncing between two sensors and only add the sensor to the trip list once the vehicle is out of the overlap detection zone when moving from one sensor to another. For example, 5 seconds minimum cross detection interval means it must be 5 seconds difference between the detection of one sensor to another sensor to add the second sensor detection to the trip list.
Min. Single Sensor Detection Interval (seconds): If set to 0, the senors with single MAC addresses detection will be included in the trip list; otherwise, more than one detection is required to include that sensor in the trip list.
Min. Same Node Trip Detection Interval (minutes): For round trips (origin and destination are at the same sensor), this parameter determines when the current trip must be terminate and the next trip should start. This interval if the time difference between the end of last trip and start of the next trip for the round trips.
Outputs #
Raw Trips Data #
The raw trips report includes the list of all trips discovered between the origin and destination points. Each trip data include the vehicle’s unique ID (such as MAC address), the origin point, selected waypoints, and the destination point. The travel time between each two sensors and the total trip travel time are also reported.
Average Trips Data #
The discovered trips list data are aggregated to generate trip average data including, the number of vehicles taking the same trip route, average, minimum, maximum, and 95th percentile travel time for a certain route.
OD Matrix #
The OD matrix report includes the number of trips between each origin and destination pair, average travel time, and trip percentages (distribution)