Sorry for the delay.
So, how about:
For an offramp, or connector between trunks or higher:<BR>
`"ref" = "Exit 54 from CA-210 East"`<BR>
`"name" = "Mountain Ave offramp"`<BR>
remove ref tag and add:<BR>
`"exit_ref" = "54"`<BR>
`"exit_from" = "CA-210"`<BR>
`"exit_from_dir" = "East"`<BR>
for an onramp:<BR>
`"ref" = "from Foothill Blvd North"`<BR>
`"name" = "I-210 East onramp"`<BR>
remove ref tag and add:<BR>
`"entrance_from" = "Foothill Blvd"`<BR>
`"entrance_from_dir" = "North"`<BR>
Assuming this is OK, how long should I wait for comment before doing this? Should I mention it on the tagging or talk-us list?list? I intend to download all the ramps I've tagged using XAPI, fix the tags with a perl script, inspect in JOSM, and upload the changes. Should take less than an hour and hopefully not result in any conflicts.