[Mando]

Snaken is correct, there is a % of the windscreen that needs to be swept to satisfy ADR, but this percentage is worked out by a formula the engineer does, it never seems to be simple. The easiest way to acheive this is 3 wipers but with a little (actually a lot of) effort you can do it with 2. It is easier to do on wiper motors that use solid connections between wheel boxes but it can be done with cable driven units. I decided to use only 2 wipers on my car.

Regards.