On the 274 from LAS tonight.

Group 1 lane off to the right of E3, and four lanes setup to the left. However signage was poor (I assume due to the number of taller poles). Signs read Groups 2-3 / Groups 4-5.
I think their intention was for Group 2 to stand in the line to the left of the sign and for Group 3 to stand to the right. However, both groups just joined one line and left the other lane empty.

But groups were otherwise enforced.