>> I've been in some modern cars where at higher speeds
The early Rover 800 had them. I'm sure it was, as GB says, to guide the window glass back in to the channel on lifting. Open a window slightly and push the top of the glass outwards with your hand*, you'll be surprised how far it moves.
re Higher speeds: Some vehicles I've had the pleasure of travelling in ('98 Volvo C70 coupe, '05 Fiat Ducato minibus spring to mind) suffer from the seals at the top of the doors (or windows on pillarless designs) "flapping" in the breeze at three figure velocities. Blimmin' noisy it is!
*Don't do this
Last edited by: Dave_TDCi on Wed 29 Jun 11 at 21:38
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