A Racing Driver

Today I can hear the booming noise of racing cars. They are racing in the Parklands around the city. I wonder what sort of cars make such a loud noise.
It is like a swarm of bees magnified a thousand times.
'They can't hurt you, Sasha. Don't worry,  they are far away.'
Why does she think I am worried? I am thinking of a new career option: racing car driver.