The sky was semi darkened with clouds and a little overcast from an incoming storm so the blue sky behind showed what I've come to hear about looked exactly like the tic-tac. It was plane as day and I thought I was seeing things since I could see airplanes flying in other directions. It was way higher and trveling at a ridiculously higher speed than planes. I was traveling on the 215 west heading towards the 15 passing rainbow when I saw it. I only had a couple seconds and but had a chance to double take to make sure I wasn't seeing things. After I said something to my fiance which she didn't believe me of course. This all happened around 4 pm in Las Vegas NV. The tic tac was traveling south towards California.