Listen to this article The start of the European season takes place at the old-school Imola circuit, which features much more aggressive kerbs than have been present at the modern venues that have hosted races so far this season. In the past, drivers have found that they have needed to ride the Imola kerbs a lot to deliver the fastest possible laptime, with the chicanes in particular offering good gains if they are straight-lined. But a new more cautious approach may be needed from this weekend because of the arrival of ground effect cars. With so much of the car performance coming from the airflow under the car, teams are having to run their machines much closer to the ground than they have in the past. And that reduction in ground clearance opens the risk for drivers to damage …