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 | |||
| 25.8 |   |
 SouthTarrytown |
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| 25.8 |  SouthBriarcliff Manor |
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| 25.9 | Croton River Road | ||
| Speed Limit 55 | Speed Limit 40 | ||
| 26.5 | Croton Point Avenue Croton Harmon Station |
Croton Point Avenue | |
| 27.2 | North  |
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| 27.9 | Senasqua Road |
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| 29.9 | Montrose Buchanan |
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| Speed Limit 45 | Speed Limit 55 | ||
| 32.9 | Welcher Avenue | Welcher Avenue Buchanan |
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| 33.4 | Louisa Street Charles Point |
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| 34.0 | South Street Hudson Avenue |
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| 34.2 |  East  East  Main Street |
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| 34.9 | West North West Bear Mountain Parkway To Taconic State Parkway |
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| Speed Limit 45 | |||
| Westchester County | |||
Poughkeepsie
| Mile | Northbound | Southbound | Notes |
|---|---|---|---|
| Dutchess County | |||
| Speed Limit 55 | Speed Limit 40 | ||
| 63.6 | |
Freeway Ends |
|
| 64.0 | Academy Street South Avenue |
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| 64.3 | Fox Street Prospect Street |
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| 64.7 | Columbia Street Rinaldi Bouldevard |
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| Speed Limit 45 | Speed Limit 55 | ||
| 65.0 |  East  East NorthChurch Street Hyde Park |
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| 65.0 | Laurel Street Rinaldi Boulevard Main Street |
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| 65.1 | East East Church Street |
West West Mid-Hudson Bridge |
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| 65.3 | West West Mid-Hudson Bridge |
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| 65.4 | Main Street | ||
| 65.7 | Albany Street | ||
| 66.0 | Water Street | ||
| Speed Limit 40 | Speed Limit 45 | ||
| 66.2 | Delafield Street Freeway Ends |
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| 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 |
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| 142.6 |  Buffalo Boston |
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| 143.0 | Northern Boulevard |  |
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| 143.4 | Freeway Ends |
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| Speed Limit 55 | |||
| Albany County | |||