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In this contribution, we discuss and analyze results from real-world performance measurements for IEEE 802.11p during September 2010 along the highway S1 near Vienna, Austria. More specifically, we evaluate the frame success ratio and goodput of the IEEE 802.11p physical (PHY) layer for a infrastructure-to-vehicle (I2V) scenario in a tunnel. We report and discuss the observed frame success ratios and goodputs for various PHY parameter settings and investigate the impact of the propagation environment and the traffic situation inside the tunnel.Index Terms-Vehicular communications, infrastructure-tovehicle, measurements, road tests, tunnel, IEEE 802.11p.