摘要: |
Electronic Fee Collection (EFC) is a key ITS application, whose technical development over the last decade has been largely focused on Dedicated Short-Range Communications (DSRC). The combination of satellite positioning, on-board processing and radio communications offers an alternative technology option for EFC, now referred to as “Vehicle Positioning Systems” (VPS). Recent trials in Hong Kong indicated that the VPS approach is fast becoming a viable alternative to DSRC, particularly where there are concerns over the environmental intrusion of roadside DSRC infrastructure and where integration with other ITS applications is an important feature. This paper describes VPS technology, discusses the development of VPS-based EFC systems in Germany, European research projects, Switzerland, the UK and, in particular, in the Hong Kong Electronic Road Pricing Feasibility Study. It describes the INITIATIVE project which is demonstrating aspects of interoperability between DSRC and VPS-based EFC. It summarises the development of standards for VPS EFC within ISO and CEN. It compares the advantages and disadvantages of DSRC and VPS approaches and concludes that VPS offers a viable alternative to DSRC for future implementations of EFC systems. |