How high will the odometer read?

I've always thought that the odometer would read as high as 999,999 miles. Some people say, however, that it stops at 299,999. Has anyone ever heard of a vehicle getting 999,999 miles? And if so, what happens if you reach one million? Does it start back over to 000,000 or does it just stop counting altogether?

my cousins roomate has a 90 or 91 fullsize chevy with 318k on it, so that truck didnt roll at 299,999 but when he bought it, my cousin showed me the o fraud, when your o rolls over, or when you turn it back, there is a line that gets burned into the wheels so people know, hey, ive got this many miles plus a rollover... although i dont know where they quit, and no never 999999 miles on a truck, but my grandpa claims his flat head 8 had close to 500k on it when he junked it

I keep mine well tuned and in good shape, I'll let you know what it rolls over at. :)

I keep mine well tuned and in good shape, I'll let you know what it rolls over at. :)
lol