here are the interesting research with field test benches developed in Instituto de Telecomunicações:
http://www.av.it.pt/a.cardote/media/
More interestingly, the researchers have planed a large scale field trial of IEEE 802.11p based VANET involving 400+ taxis in Porto ;-) For more details, please their speech on RTCM 2011.
RTCM_1_Jul_11_s4p2.pdf