Hi Doug, you have the right idea with the tag, but it should have both highway=crossing and crossing:island=yes (see https://wiki.openstreetmap.org/wiki/Key:crossing:island). Before getting too far into that, though, it looks like Lyndale needs to be split into two one-ways where the island is, and 45th St split so that cars won't get routed through the island. If you want help on that, you can message me! Happy mapping, Brad