I think they have a positive effect. I have been in several situations were I handled the car in way which I could have only learned in a racing sim. One instance I can remember is where I came round a semi blind corner at about 60, normal for that section of road, not speeding. What was before me on the road? A van sitting there right in the middle of the lane. They were resurfacing a few hundred meters down the road and a queue had formed from the traffic lights. There were no signs at all and the queue finished just after the corner. I was driving a little fiesta and had never had to brake like that, in any car. But the braking wasn't enough.. the front left locked and I actual had to steer around the van, while skidding. It's all a blur now but I came to rest exactly along side the van on the wrong side of the road. The driver just looked with his mouth open. Had I not been playing Driver and Gran Turismo on the Playstation 24/7 around that time I don't think the 'instinct basics' of how to control an under steering car would be there. In the panic I would have slammed into the back of the van and probably lost my legs or something..... mostly due to the crapness of the Fiesta. I think that computer games give you a very slight insight of how a car will react when pushed. There is no other way to learn without skidpan training. Forgetting car games specifically. How can vastly improved hand eye coordination not have a positive effect on car control. You already have the skill to displace you mind in that way... if that makes sense. Not controlling your body but something else. In a car accident rasing your arms to protect your face does no good. That's a fairly heavy instinct you need to over come when something is about to hit you. If you play games the brain rewiring required to maintain the cars protection... thus ultimately yourself.... has already been learned from many many hours of "inhabiting" avatars and virtual machines.