The DTM will use an onboard lighting system to show when cars are racing on option tires at Brands Hatch this weekend in response to the confusion generated by the new rubber at Hockenheim.
The Formula 1-style option tires were introduced at Hockenheim two weeks ago as part of a series of technical changes aimed at spicing up the on-track action.
The option Hankooks were marked with a yellow stripe in order to allow spectators to see when a driver was using his one permitted set of the soft rubber during the race. However, the stripe proved difficult to spot. With timing screens and television graphics also failing to display sufficient information, fans, commentators and even teams were unable to spot what many cars were using at any given time.
Series promoter the ITR has responded by using the blue lights mounted on the sides of each car –and previously used to show how many pit stops a driver had made – to display tire usage. The blue lights will come on when a car is on option tires and will be turned off when it is using the harder, standard rubber.
ITR chairman Hans Werner Aufrecht said: "We have to involve and inform both the fans on-site and watching on TV much better. To them the races must be more clear.
"The race at Hockenheim made clear that identifying the yellow marks on the option tires was virtually impossible. Consequently even our TV commentators had the problem of identifying what was going on.
"We are working in cooperation with [German motorsport federation] the DMSB and Hankook on ways to improve this, such as using the LED lights. We hope that this will be a significant step forward at Brands Hatch."
The possibility of widening the yellow stripe on the options, so as to make it more visible, is also being evaluated.