Why "yellow cards" can stop a demolition derby

Why

A new system designed to prevent a 'demolition derby' made its debut last weekend, and the idea of a yellow card warning for bad behaviour has made an immediate impact in correcting the course

"The racing was good, people loved it. Nothing silly happened, which is what we want to see." That was the assessment of ABB FIA Formula E championship leader Jerome D'Ambrosio following last weekend's event in Rome.

It was a race of notable high quality, the first lap aside, filled with intrigue and a close fight for the win. But it could all have been so different had something 'silly' come to pass.

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