But sometimes it takes a few laps of the field of cars to clear away the spray. Under race conditions this can be dangerous. Behind the safety car it is less so, as the drivers aren't pushing. The only problem here is it makes the restart dangerous with low tyres temperatures etc. But I think that was compensated for in Canada this year as it was nearing the conditions required for inters, meaning the full wets would have come up to temperature very quickly (Though the same can't be said for the brakes).