Michael Carroll, who for the last few months has been leading the Streets Department, has been promoted to oversee the city's transportation and infrastructure systems.

Mayor Kenney announced Monday that Carroll would be the new deputy managing director for transportation and infrastructure systems, in charge of the Streets and Water Departments as well as the Office of Complete Streets. Carroll will coordinate with several authorities and utilities, including SEPTA, the state Department of Transportation, Peco, and the Philadelphia Gas Works. Carroll is taking a job previously held by Clarena Tolson, who in October became the executive director of the Parking Authority.

"It's a great pleasure to have Mike Carroll in this crucial position," Managing Director Michael DiBerardinis said in a statement. "He brings a wealth of knowledge and experience, from the nuts-and-bolts operations of crucial city services like Streets and Water, to the long-range vision needed for effective transportation planning."

Carroll has been the acting commissioner for the Streets Department. He will be paid $160,000 in his new role.

Carlton Williams, a deputy streets commissioner for sanitation and a former commissioner of the Department of Licenses and Inspections, will now serve as streets commissioner, Kenney announced Monday.

Williams will be the third person to lead the department in less than a year. Kenney's first streets commissioner, Donald Carlton, was demoted to deputy level in September after he was charged with punching a man in December at a family get-together. (Carlton pleaded guilty to one count of simple assault.)

Keith Warren will take Williams' deputy streets commissioner job, overseeing sanitation. Warren has been with the Streets Department since 1994 and worked his way up from laborer to sanitation operation administrator, his most recent position.

In other Streets Department moves, Kenney announced that Richard Montanez will be the deputy streets commissioner for transportation.  Montanez will administer the city's traffic engineering and maintenance programs. Montanez recently served as the chief traffic and street lighting engineer.

Kenney also said Monday that Christopher Puchalsky will join the Office of Transportation and Infrastructure Systems as director of policy and strategic initiatives. Puchalsky was previously a division director for transportation planning at the Delaware Valley Regional Planning Commission.  In that role, he oversaw the Office of Corridor Planning and the Office of Transit, Bicycle and Pedestrian Planning.