In reference to SH-584, before the pull the old ON-11 route GSV (hoping the links still work after that happens):
On *original* ON-11, SH-584 has 'TO' shields going each direction.
EB/
WBHowever, was fully signed as normal at the intersection, complete with an '
END shield. Here's the first
NB shield just above the intersection w/o any 'TO' mention. So, not sure what was up with those 2 'TO' shields on ON-11, as the route is fully signed thru town, even though it's not maintained by the MTO.