The Federal Highway Research Institute (BaST) provides public traffic volume data for German highways and federal roads. The data is broken down by vehicle type (cars, buses, trucks, ...) and direction of travel.
monthly
hourly
2258 Stations 51726 Sensors
Data provided by Bundesanstalt für Straßenwesen Datenlizenz Deutschland Namensnennung 2.0“ (CC BY 2.0 DE)
https://www.bast.de/DE/Verkehrstechnik/Fachthemen/v2-verkehrszaehlung/Verkehrszaehlung.html