US 9 has two sections where it forms its own freeway; an extension of the Briarcliff-Peekskill Parkway known as the Croton Expressway, and a freeway section in Poughkeepsie. It also has a short freeway segment in Albany that was supposed to be part of the Mid-Crosswtown Arterial, a north-south expressway running from the I-787/Thruway junction to I-90. The Croton Expressway was once planned as an alignment of I-87 between I-287 and I-84; the designation I-487 was also considered, and the I-87 plans were cancelled when the section north of Peekskill was cancelled (the section south to Tarrytown was later cancelled as well).
Croton Expressway
| Mile | Northbound | Southbound | Notes |
|---|---|---|---|
| Westchester County | |||
| Speed Limit 40 | |||
| 26.0 |   |
 SouthTarrytown Freeway ends |
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| 26.0 | Left SouthBriarcliff Manor |
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| 26.1 | Croton River Road | ||
| Speed Limit 55 | Speed Limit 40 | ||
| 26.8 | Croton Point Avenue Croton Harmon Station |
Croton Point Avenue | |
| 27.5 | North  |
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| 28.1 | Senasqua Road |
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| 28.3 | Senasqua Road |
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| 30.1 | Montrose Buchanan |
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| Speed Limit 45 | Speed Limit 55 | ||
| 33.2 | Welcher Avenue | Welcher Avenue Buchanan |
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| 33.6 | Louisa Street Charles Point |
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| 34.3 | South Street Hudson Avenue |
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| 34.5 |  East  East  Main Street |
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| 35.2 | West North West Bear Mountain Parkway To Taconic State Parkway |
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At-grade intersection |
| Speed Limit 45 | |||
| Westchester County | |||
Poughkeepsie
| Mile | Northbound | Southbound | Notes |
|---|---|---|---|
| Dutchess County | |||
| Speed Limit 55 | Speed Limit 40 | ||
| 63.7 | |
Freeway ends |
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| 64.1 | Academy Street South Avenue |
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| 64.4 | Fox Street Prospect Street |
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| 64.8 | Columbia Street Rinaldi Bouldevard |
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| Speed Limit 45 | Speed Limit 55 | ||
| 65.1 | Left East  East NorthChurch Street Hyde Park |
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| 65.1 | Laurel Street Rinaldi Boulevard Main Street |
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| 65.3 | Left East East Church Street |
Left West West Mid-Hudson Bridge |
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| 65.4 | Left West West Mid-Hudson Bridge |
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| 65.5 | Main Street | ||
| 65.7 | Albany Street | ||
| 66.1 | Water Street | ||
| Speed Limit 40 | Speed Limit 45 | ||
| 66.3 | Delafield Street |
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At-grade intersection |
| Speed Limit 40 | |||
| Dutchess County | |||
Mid-Crosstown Arterial
| Mile | Northbound | Southbound | Notes |
|---|---|---|---|
| Albany County | |||
| Speed Limit 55 | |||
| 141.9 | |
South Livingston Avenue Henry Johnson Boulevard Freeway ends |
Stub ramp |
| 142.2 |  Buffalo Boston |
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| 143.0 | Buffalo Boston |
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| 143.3 | Birch Hill Road |
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At-grade intersection The southbound ramp to NY 377 and Northern Boulevard begins north of this point and travels through the at-grade intersection as a side road |
| Speed Limit 55 | |||
| Albany County | |||