It was lit up a huge saucer flying south in the sky at the speed of light and flashing

I was driving home from work on the freeway going north I saw a saucer shaped craft with the whole craft lit up with one led light .it was bigger than any plane I have ever seen flying didn’t make noise and was low to the ground to where I saw the whole shape and craft itself .it was moving Erratically in fast motions for about 10 seconds going south I was watching until it took off so fast I couldn’t see it anymore . I could see it in the clouds and it lit up half the sky it didn’t have multiple lights it was just one huge light in the shape of a saucer and I could see the craft not just the light