I just completed laying out the highway and entering basic tagging for all of I 81, including the intersections, in Maryland. I'll need to go back and correct some of the streets that cross it, and enter exit numbers, but other than that, I think all the basic info is there.

I'll also need to go back and create/add relations for the Maryland section of I 81 as the reply to my previous diary entry describes. If anyone wants to critique what I've done, I would appreciate it. The highway is the North-South road in this general location:

osm.org/?lat=39.6499&lon=-77.7533&zoom=12&layers=B000FTF

Please let me know if I've been leaving out any major/common tags, and what kinds of details should be included on US Interstate Highways - probably number of lanes, speed, etc. I've read about lots of things that can be added, but the Wiki and talk pages didn't really make it clear if there was some sort of standard people were following.