Compressed Natural Gas (CNG) Sweeper Operation Evaluation

Several counties across California have begun to switch from diesel-powered street sweepers to CNG (Compressed Natural Gas) street sweepers, in order to comply with Federal and State air quality regulations. In this report, the authors study the productivity and cost impact of using CNG sweepers as opposed to the diesel sweepers in Caltrans District 7. As part of this study, they reviewed the prior literature on the use of CNG vehicles, conducted crew site visits, and analyzed data from Caltrans’ Integrated Maintenance Management System (IMMS) and maintenance cost records. The authors' findings on the productivity and cost of CNG sweeper operations are consistent with previous results found by researchers studying the use of CNG buses in mass transit and United Parcel Service (UPS) delivery. One key problem with the CNG sweepers is that the CNG fueling stations might be located far from the yard and the waiting time at the fueling station may be long. On balance, the move to CNG sweepers has resulted in a reduction in the productivity of sweeping operations. Consistent with other applications, there is no significant difference between the maintenance costs of the diesel and CNG sweepers. To offset this loss in productivity with CNG sweepers, the authors developed mathematical optimization models to make specific recommendations regarding (1) the locations where Caltrans should promote the use of CNG fueling stations, and (2) the rebalancing of the routes.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Project Report
  • Features: Figures; References; Tables;
  • Pagination: 61p

Subject/Index Terms

Filing Info

  • Accession Number: 01752950
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Report/Paper Numbers: CA09-1099
  • Created Date: Jun 9 2016 6:46PM