Average number of vehicles per day using an urban road over the course of a year
Organizations should footnote all assumptions used, including source(s) of data.
This metric is intended to capture volume of traffic in a particular market, expressed as total number of vehicles using an urban road annually.
Organizations may also choose to report this utilization rate for other time periods (e.g. utilization per day or month). Utilization level of a road, particularly over time, serves as a proxy for the qualitative contribution of new transportation infrastructure to economic activity.
GPS traffic data providers can provide traffic counts by side of the road, day of week, or time of day.
This metric is often used by International Finance Institutions (IFIs) as part of Transportation analysis. When toll roads are not part of a project, average daily traffic is not a good indicator of impact performance, unless the corresponding transport or transit agency monitors congestion and/or traffic.
January 2020 - IRIS v5.1 Released
New metric. Average Daily Traffic (OI0659) developed through partnership with HIPSO.
IRIS Metrics Work Better in Sets
To use IRIS metrics—and the resulting data—to understand impact performance, IRIS metrics should be used and analyzed in generally accepted sets and according to well-defined objectives. IRIS+ gives you access to generally accepted Core Metrics Sets aligned to common Impact Themes and Sustainable Development Goals (SDGs).