There are two sets of shuttles with two separate lines at the summit; one marked Manitou, the other marked Devil's Playground.
One will take spectators to and from devil's playground. These vans just make a loop from the summit to devil's playground (13,000ft) and then right back again.
The other set of shuttles make a loop between the summit and Glen Cove (11,000ft), at which time the runners / volunteers / race officials will transfer over to a bus to complete the trip down to Manitou (6,300ft). These shuttles do not stop at devil's playground. There is a large pavilion setup at Glen Cove with seats, refreshments, etc for the runners as they wait for the next bus to arrive.