In the paper, the authors refer to measurement of a car cabin heat load and indoor environment during driving in real traffic conditions. The primary aim was to obtain data for boundary conditions, model testing and results comparison of the 1D car cabin heat load model. The secondary aim was better understanding of cabin environment inside a car cabin under different operational conditions. As test vehicle Škoda Felicia Combi with dark blue painting was used and GPS data, parameters of ventilation, cabin environnment and ambient environment were measured. Measurements were preformed for summer, autumn and winter conditions including parking and driving test circuits around Brno. Driving circuit included driving in the city, out of the city and on the highway D1. and Obsahuje seznam literatury