References
- Department of Statistics, Singapore . 1981/82 . Yearbook of Statistics Singapore 1981/82
- Department of Statistics, Singapore . Jan. 1992 . Monthly Digest of Statistics Singapore Jan. , 1992.
- Registry of Vehicles, Singapore . 1990 . Annual Report
- Sydney Co‐ordinated Adaptive Traffic System (SCATS) . 1988 . “ User's Manual ” .
- Tan , S. B. . PWD Technical Seminar—Computerised Area Traffic Control System . Singapore. unpublished.