Please edit this paragraph?

hello,
i'm writing a descriptive composition. Can you please edit this paragraph to make it more descriptive, please?

I was driving around the roundabout in 3rd miles and wanted to take the second exit off the roundabout into McDougal Road (or leave the roundbout into the second exit towards McDougal Road). Unaware of a car speeding from behind on the outside lane (there were three lanes at the roundabout- the left, the middle and the right one), i just drove out of the roundabout and got rammed into by the car. My car flew off the ground and tumbled three times till it hit the divider and stopped.

Thanks.