Single Status Update
You can't make a left hand turn from Mastic Road to Montauk Hwy. The 7D use to cut up a side road but stopped doing that a few years ago. Suffolk had made the change to the schedules but may have changed back because some idiot put up a new bus shelter and for some reason put a 7D sign there. Also the 7D uses Turn onto Titmus from Montauk, even though the Schedule, I don't know the reasoning behind this however though I know they have been doing it as long as I can remember.
Yeah the 3D and S71 in Stony Brook are correct.
All Smith Haven Mall (The 3D is fine when it comes to/goes to Brentwood)use Burr road to get to the bus stop. The S58 uses the path as the S56 and so does the S62 when it comes/goes to Hauppauge.
The S71 uses the LIE now to get to Yaphank road from Sills road(CR101), its a new thing and is hard to tell on the schedule.
You have some stuff wrong in Riverhead if you are interested.