I won't argue the conclusion, just introduce an anecdotal observation.<p>When it is spitting or raining very lightly, sit in a stopped car and watch the rain on the window.<p>Now, speed that car up to about 80km and see what happens. Disregarding spray from other vehicles, odds are that there will be <i>more</i> rain on the windshield in the same amount of time.<p>Like I said just an observation.