Road traffic on the Isère departmental road

This dataset represents the road counts carried out on the various sections of the departmental roads (RD) of the Isère. These data are collected and analysed by the Mobility Department and integrated into the Departmental Road Information System. They are a real decision support tool to feed the Isère road master plan and adapt the policies for the operation, maintenance and modernisation of departmental road infrastructure. The data collected make it possible to assess the traffic of light vehicles and heavy goods vehicles. For each collection point, the count indicates the annual average daily traffic (AWTM) “obtained by calculating the yearly average of the number of vehicles circulating on the observed section, in all directions, during a day”. The number of heavy goods vehicles in the traffic composition accompanies the TMJA. The data collected make it possible to produce each year the “Annual Daily Traffic Maps” (TMJA) made available on the website [isere.fr](https://www.isere.fr/routes-transports) The counts are obtained from two types of traffic surveys carried out on the roadway: * Via permanent counting stations that report their data year-round: nearly 100 counting stations currently deployed * Via ad hoc surveys (road meters, pneumatic tubes temporarily installed depending on the importance of the tracks or for the purposes of studies of specific projects, safety operations...): between 100 & 300 one-off surveys organised per year The number of counting points therefore varies according to the years and needs for one-off surveys. This dataset offers a traffic history since 2009. Due to the health context linked to Covid, the years 2020 and 2021 were marked by a drastic decline in car traffic on departmental roads during the lockdown periods. It has not been possible to consolidate consistent figures for these years.