Data Sharing Glossary and Metrics for Shared Micromobility is a 19-page document focuses on vehicle and trip level data. It provides standardized, often hierarchical, definitions of terms as well as vehicle-based and trip-based performance metrics and standardized methods for calculating these metrics.
As stated in the document’s introduction 1 , it “provides a consensus-based set of definitions for terms and metrics that are commonly used. It outlines key vehicle, trip, and geospatial definitions and metrics to reduce discrepancies in the terminology used across jurisdictions and sectors and allow public agencies to clarify policies related to shared micromobility.”
The definitions are short English text descriptions. For example, a vehicle is “a motorized or human-powered vehicle could include an automobile, motorcycle, (e-)bike, e-scooter, or moped that is used for transportation.” At the highest level, a vehicle may be in “Deployed,” “Removed,” or “Unknown” status. Deployed Vehicles may be “Operational” or “Non-Operational”. Operational Vehicles may be “In-Use” or “Available.” Both “Available” and “Non-Operational” vehicles are in the “Idle” state.
To fully define vehicle and trip terms, several geographic (e.g., “Service Area,” “Waypoint”) and time related (e.g., “Available Time,” “Operational Time”) terms are also defined.
The document then defines many vehicle and two trip-based performance metrics, along with mathematical formulas for how they should be calculated. For example, the average number of vehicles of a specified status in a specified geographic area over a specified time period is given as:Where:
- avg_veh = average number of vehicles of a specified status
- vehi = number of vehicles of a specified status at 𝑖
- 𝑖 = sampling frequency (e.g., time units in minutes)
- 𝑇 = time period of interest (i.e., total number of 𝑖 samples)
- 1Mobility Data Collaborative. (2020). Data Sharing Glossary and Metics for Shared Micromobility. SAE. https://www.sae.org/standards/content/mdc00002202004/