For High Hill, I made sure Route F connected as specified by the relevant MoDOT travelways because Booneslick Road is not state-maintained. I have seen errors in the travelway defs for interstate interchange connection before, e.g. another Route F over in Wright City where the travelway says it goes to I-70 but the signs clearly state where maintenance ends. MoDOT would generally want a fully state-maintained connection to the interstate, though, unless posted otherwise, so I followed the travelways here in connecting F through.