No worries, we all get caught up sometimes.

There isn't really a 'best' way to map these sorts of bulb-outs as linear roadways. As a highway=turning_circle, it's unusually short and stubby, but as a one-way loop following the path of buses, it would imply the existence of a traffic island. In good faith, I've restored the roadway geometry as a turning circle: https://www.openstreetmap.org/changeset/158834101

I'm sure we're not the first to encounter this, though. I've started a thread on the forum: https://community.openstreetmap.org/t/is-this-bus-turnaround-a-highway-turning-circle/121261