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Unfortunately no regional road passenger data are currently collected.
Passenger cars per thousand inhabitants is an interesting of how much cars are used in different regions compared to public transport, although it is also is related to income as well. These data can be visualised on the Eurostat website directly here https://ec.europa.eu/eurostat/databrowser/view/TRAN_R_VEHST__custom_250445/default/map?lang=en.
Road accidents per million inhabitants by region can be plotted in a similar way. There is an important disclaimer to note, which is that this will likely overrepresent the road danger in some sparsely populsted regions that have principal roads passing through them. The below image is sourced directly from Eurostat's data browser https://ec.europa.eu/eurostat/databrowser/view/tran_r_acci/default/table?lang=en.
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