The Adirondack Northway has a southern extension from the I-87/I-90 junction to US 20. This extension is a remnant from plans to run I-87 parallel to the Thruway to I-787 and is numbered as reference route 910F. It is known as Fuller Road Alternate in NYSDOT's databases. The sourthern stub with US 20 was modified to include a loop ramp from US 20 eastbound and an interchange was constructged with Crossgates Mall (the mall built the ramp to the mall; the ramp to the Northway was constructed later by the Town of Guilderland).
| Mile | Northbound | Southbound | Notes |
|---|---|---|---|
| Albany County | |||
| Speed Limit 55 | Speed Limit 45 | ||
| 0.0 | Fuller Road Alternate North |  Western Avenue |
At-grade intersection |
| 0.3 | Crossgates Mall Road | ||
| Speed Limit 45 | |||
| 0.9 | Exit 1E EastAlbany Boston |
||
| 0.9 | Exit 1W South  WestNew York Buffalo |
||
| 0.9 | North Montréal |
Fuller Road Alternate South | |
| Speed Limit 55 | |||
| Albany County | |||