British engineers are building a supersonic car which they say will travel faster than a speeding bullet.
The team raced to a new world record back in 1997, breaking the sound barrier in the Nevada desert in America in a jet-powered car.
But now they want to go even faster, and are working on a car to reach 1,000 miles per hour.
Known as Bloodhound, the supersonic car will be powered by a rocket bolted to a Typhoon-Eurofighter jet engine.
The engineers say the car will be able to travel the length of four football pitches every second.
They've been working on the idea for a year-and-a-half.
This is what the car might look like
And they're hoping to be ready to try for a new world record in 2011.
Bloodhound project leader Richard Noble said: "This is one of the most exciting things you can do on God's Earth.
"When you've the opportunity to do it really, really well, with the latest technology, you can't resist the challenge."