Road counting — Traffic data from permanent sensors

**Road traffic data from permanent sensors over 13 months slippery in J-1** On the Parisian network, traffic measurement is mainly done through electromagnetic loops implanted in the roadway. **Historical data** are available in the dataset [Road Counting — History — Traffic data from permanent sensors](https://parisdata.opendatasoft.com/explore/dataset/comptages-routiers-permanents-historique/information/) The data is produced by the Directorate of Highways and Travel — Travel Service — Central Operating Station Lutèce. The data and associated visualisations (Table, Map and Dataviz) are raw without any interpretation or analysis. They show the data as published daily. They provide an overview of the occupancy rate and flow rate on more than 3000 stretches of track. On their own, they do not make it possible to characterise the complexity of traffic in Paris. **Two types of data are thus developed:** * ****** the occupancy rate**, which corresponds to the time of presence of vehicles on the loop as a percentage of a fixed time interval (one hour for the data provided). Thus, 25 % occupancy rate over an hour means that vehicles were present on the loop for 15 minutes. The rate provides information on road congestion. The implantation of loops is thought to be able to deduce, from a point measurement, the state of traffic on an arc. ******* The flow** is the number of vehicles passing the counting point for a fixed time interval (one hour for the data provided). **The hourly timer is done at the end of the production period.** For example, the “2019-01-01 01:00:00” horodate refers to the period from 1 January 2019 at 00h00 to 1 January 2019 at 01h00. Thus, the observation coupled at one point of the occupancy rate and the flow rate makes it possible to characterise the traffic. This is one of the foundations of traffic engineering, and it is also called the “fundamental diagram”. One throughput can correspond to two traffic situations: fluid or saturated, hence the need for the occupancy rate. For example: over an hour, a flow rate of 100 vehicles per hour on a usually very busy axis can meet at night (fluid traffic) or in rush hour (saturated traffic). **The equipment of the Parisian network:** The main axes of the City of Paris are equipped with stations for counting vehicles and measuring the rate of occupancy, for purposes of both traffic and public transport regulation, information to users (broadcasting on the Sytadin site), and study. There are two types of stations on the network: stations for measuring the occupancy rate alone, and stations for both the measurement of the rate and the counting of vehicles. The rate measurement stations are installed very regularly: they allow a fine knowledge of traffic conditions. Flow stations are less numerous, and are usually located between major intersections. Indeed, the flow is usually maintained on a section between two major crossroads. **Referential:** The repository is available on this dataset “[Road counting — Geographical reference](https://parisdata.opendatasoft.com/explore/dataset/referentiel-comptages-routiers/information/)” with the following characteristics: * Encoding: UTF-8 * Projection: EPSG:2154 (Lambert 93 — RGF93) The fields awarded are: see the data model below and the leaflet as an attachment. ** Traffic data:** The fields awarded are: see the data model below and the leaflet as an attachment.