Probably set for warp speed, so when used by humans at mortal speeds most of the jet goes straight over the top.
Best washwer jets i've ver seen are on 2006 on Hilux, jet forms a swirly pattern which covers the whole screen at any speed.
Maybe they have a "motorway speed setting" set at the Audi-driver's minimum (non-traffic jam) speed of 90mph? :-)
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