Monaco sees light over tunnel vision.

Monaco Grand Prix organisers have installed a revolutionary system to try and combat the changing light levels encountered by drivers in the famous tunnel section of the circuit.

For years, competitors in the various races around the principality have complained of a sudden loss of vision as they go from the usually sunlit outdoor sections into the tunnel which curves its way under one of Monte Carlo's many hotels. The phenomenon is known as the 'black hole effect', and is a recognised complaint in everyday driving as well as racing.

In order to try and limit the effect at this weekend's grand prix, race organisers the Automobile Club de Monaco have invested in a system which attempts to lessen the change in light levels between sunlight and darkness.

Known as UBD, the technology works by reflecting the light from outside the tunnel towards its entrance, thereby reducing the difference in light in the yards immediately before and after the mouth.

Previous electric lighting solutions failed to produce the right effect and, with drivers wearing tinted visors to combat the bright sunlight, a new solution was required.