Laverty puts in a quick lap to edge out Biaggi
The final day of testing saw rain in the morning, which interrupted proceedings for a couple of hours, but the track then was then dry until late in the afternoon when further rain brought an end to the tests for Yamaha and Aprilia.
Biaggi, quickest on the first two days of the test, did not have time to respond to Laverty's mark and the Aprilia rider had to settle for second-best with a time of 1'32.1.
Leon Camier stayed third on the second Aprilia, just three-tenths off the pace of Biaggi, while Marco Melandri also recorded the same time for Yamaha. The Italian took the opportunity to gain confidence with Pirelli's rain tyres as well as run with some 2011-spec rubber.
Unofficial times: 1. Laverty (Yamaha) 1'31.5 (on soft tyres); 2. Biaggi (Aprilia) 1'32.1; 3. Camier (Aprilia) 1'32.4; 4. Melandri (Yamaha) 1'32.4.