The Division of Traffic Engineering and Operations (DTEO) is responsible for establishing speed limits along County roadways. A representative from DTEO will respond within 10 business days to further discuss the request and determine the appropriate course of action. For maintenance of numbered routes, such as MD 355 (Rockville Pike) or MD 28 (Darnestown Road), please contact the Maryland Department of Transportation State Highway Administration at 301.513.7300.