Results were mixed as the lack of mechanical grip resulted in the more ingenious designers clawing back the deficit with aerodynamic grip – pushing more force onto the tyres through wings and aerodynamic devices, which in turn resulted in less overtaking as these devices tended to make the wake behind the car 'dirty' (turbulent), preventing other cars from following closely due to their dependence on 'clean' air to make the car stick to the track. The grooved tyres also had the unfortunate side effect of initially being of a harder compound to be able to hold the grooved tread blocks, which resulted in spectacular accidents in times of aerodynamic grip failure as the harder compound could not grip the track as well.