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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]That the exit numbers on 270 indicate how many miles you are from the start of 270.  I just assumed they were random numbers and skipped numbers in the event future exits were built.  Not one of my smartest moments.[/quote]

It's not just 270.  It's all interstates.  I just learned this last week... my boyfriend was explaining to me that if we are at exit 16 and need to get off at 26 we have 10 miles to go.  I had no idea.

I did, however, always know that the numbers start over at state borders. [/quote]

Not necessarily. There are a number of states (Connecticut, Massachusetts, NH, Vermont, Delaware, Rhode Island, most interstates in New York) where the interstate exits are not based on mileage, but are in sequential order[/quote]

Mileage based exits are federally mandated now, so the states that haven't switched yet will be doing so soon (or lose federal highway funding).  Massachusetts is starting next summer and will be done by 2022. [/quote]

Be that as it may, not all interstates now (or before) had mileage based exits[/quote]

Also, they count the miles from south to north and west to east, which seems upside down and backwards. And the posts between the mile markers are generally 1/10 of a mile. It's not just the beginning of the interstate, the count starts (generally) at the borders of states. [/quote]

And US highways count and are numbered in the other direction.[/quote]

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