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Twinbrook Parkway, Northbound
| 2010 | Jan. | Feb. | Mar. | Apr. | May | Jun. | Jul. | Aug. | Sept. | Oct. | Nov. | Dec. |
| Vehicle Passes | 110592 | 86068 | 120391 | 117841 | 122351 | 123297 | ||||||
| Average Speed | 21.16 | 21.11 | 21.07 | 21.27 | 21.96 | 22.62 | ||||||
| Citations | 227 | 176 | 205 | 193 | 270 | 256 |
| 2009 | Jan. | Feb. | Mar. | Apr. | May | Jun. | Jul. | Aug. | Sept. | Oct. | Nov. | Dec. |
| Vehicle Passes | 10698 | 130586 | 127221 | 122406 | 123557 | 125228 | 113181 | 110367 | ||||
| Average Speed | 23.32 | 22.24 | 22.38 | 22.25 | 21.99 | 21.59 | 20.97 | 20.76 | ||||
| Citations | 688 | 631 | 470 | 327 | 244 | 39 | 208 |
Rockville City Police
Department of Public Safety
111 Maryland Avenue, Rockville, MD 20850
In case of emergency, call 911
240-314-8900 (non-emergency)