Adding on... For the turnarounds:
shuttles run on Archer, terminate at 150th Street (near the Q4, 5, 42, etc. layover). Then for the turnaround, the shuttles turn left onto 153rd Street, right on Jamaica Avenue, right on Parsons Blvd, right on Archer, then start service and head back to Forest Hills.
shuttles run through Hillside, turning right on 175th Street, followed by a left on Jamaica Avenue, then another left on 179th Place, layover, then left on Hillside and back to Forest Hills.
As for the turnaround near Forest Hills, they turn at 70th Road (some turn onto 108th Street first, then 70th Road to Queens Blvd).
That was the route of the shuttles I rode on the 15th. Speaking of which, the shuttles caused major delays on Jamaica Avenue. There were roughly 20 or so shuttles lined up around the block from Archer and 153rd over to Parsons, around to Jamaica and back again to 153rd. All of those buses were on the one eastbound lane on Jamaica Avenue, so pretty much no traffic could get through that block for a while...