> >The exit numbers aren't sequential: the exit
>>number corresponds with the kilometer marker, so
>>an exit number at marker 20 would be exit 20,
>>and the next exit might be 35 or something.
>
> That's the only way I've ever seen it done--exit
>number corresponds to mile marker. Is the road
>system different on the East coast?
>

Yes. Most places on the east coast, exits are numbered sequentially, not by mile marker. I can't remember now at exactly what point it changed in my cross country journey, but I *do* have a vivid memory of seeing my first exit sign numbered in the 200's and thinking "AH! I'm NEVER going to get out of this state!!"

Of course, when I got to Colorado, the first exit I saw was number four hundred and something.

-- Dave