May well apply equally to other cars too.
Drove for the 1st time in heavy rain in my new Golf yesterday. Joining dual carriageway on a slip road. Accelerate to match speed of traffic on road. Suddenly a couple of seconds before joining a dark Mondeo appears from behind my 'A' pillar. Not a problem, I eased off and tucked in behind it, but I certainly lost it somehow on the approach. You can lose a cyclist in the pillar if you're not careful, but a whole car?
Much has been said here about the obstruction of vision from the 'A' pillar. Personally I do think its not ideal but you basically alter your observation to take account of the obstruction. But something made my little incident much worse. The windscreen on the Golf is pretty flat and recessed. Yesterday I noticed that water coming off the driver's side wiper tends to pool on the far right of the windscreen. It also ripples with the slipstream, rendering it impossible to see through, (about 3-4 inches wide obstruction). This created a roughly 8 inch 'blindspot'. Given the colour of the Mondeo, the heavy spray and the lack of light (dull but not dark enough for lights to stand out) I realised that my poor observation had been made considerably worse by this pooling water.
Any one else noticed this? 'A' pillar obstruction is dangerous enough without adding to it.