This is a small change (along with a suggestion to show the arrows on the corresponding left or right side of riders) that could make it easier to sense the primary direction planned by a group. I suggest adding an arrow indicator icon in the space with the rider names on the right. In this way if you see ~20 people all planning to turn left in an event you are less likely to get the turn wrong.
I was just pondering this exact thing last night as I was trying see where the rest of my race group was going. If you are in front you can’t see the other riders flashing behinds :)
Totally agree, a small little arrow on the right side rider list would be an easy addition.