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WMSC modify DRS and tyre usage rules for wet events 09 Mar 2012

Fernando Alonso (ESP) Ferrari 150 Italia leads team mate Felipe Massa (BRA) Ferrari 150 Italia as Mark Webber (AUS) Red Bull Racing RB7 and Lewis Hamilton (GBR) McLaren MP4/26 tangle.
Formula One World Championship, Rd 7, Canadian Grand Prix, Race, Montreal, Canada, Sunday, 12 June 2011 Nico Rosberg (GER) Mercedes AMG F1 W03.
Formula One Testing, Day 3, Barcelona, Spain, Saturday, 3 March 2012

The World Motor Sport Council (WMSC) met on Friday in the Italian city of Milan and agreed a number of minor changes to the sporting regulations. The amendments include tweaks to DRS and tyre usage at events affected by wet weather, and a slight modification to the curfew rules for team personnel.

Details from the WMSC in full:
The changes to the 2012 Regulations have been approved by the Formula One Commission.

One set of dry-weather tyres may now be carried over to Saturday if both Friday sessions are declared wet; it is hoped that this will result in teams carrying out more laps on Saturday.

Changes have been made to the personnel curfew to ensure the rest periods remain constant throughout the season, irrespective of the timing of practice sessions at particular events.

The race director may now prohibit the use of the adjustable rear wing (DRS) if he feels visibility is too poor in wet conditions. This has been done as a result of safety concerns over large speed differentials between cars.