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The UNECE E-Road Census collects traffic volumes on principal arteries of international importance. Data are only collected every five years. Data for 2025, 2010 and 2005 can be explored here https://www.unece.org/trans/main/wp6/e-roads_maps.html.
In addition to the census data collected directly by UNECE, Eurostat collects many different regional datasets that can be visualised, some of which are on an annual basis. While the UNECE censuses collect traffic volumes, i.e. number of vehicles per day, the Eurostat data focus on transport measurement, that is passenger numbers and passenger-km, tonnes and tonne-km.
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