Jackie Stewart

The years I raced in were fantastic. There was so much change in the cars. We went from treaded tyres to no wings right through to slicks to enormous wings.

We were racing at circuits where there were no crash barriers in front of the pits, and fuel was lying about in churns in the pit lane. A car could easily crash into the pits at any time. It was ridiculous.

It takes leadership to improve safety. And I started off the movement in my time, but the person who has done more over the past 20 to 30 years and who has led it is Professor Sid Watkins.

There has been a huge advance in technology, which has improved the safety of the cars incredibly, but there are still some heavy crash impacts and in certain circumstances there is still the chance of fire today.