Funny thing happened to me on my way to Fort McMurray, I was watching my odometer going 299998 then 299999 and then back to 0! i should have parked it and taken it to Barrett Jackson as a classic with no Km's on it. See attached image
when the chevy trucks hit near 1 000 000 kms they send out and error and the odometer has to be replaced
i pulled over to take the image, you can even see the 4 way flashers going