Several Wireless LAN handover schemes have been proposed for access networks. These efforts have not yet, however, produced a satisfactory solution for access networks that provide broadband internet services to moving vehicles such as express buses, trucks and high-speed trains. In this paper, we propose a WLAN access network system for high-speed moving vehicles. The proposed system achieves a short handover time and no packet loss during handove. A daisy-chain network architecture reduces construction costs to enable the wide deployment of many WLAN access points. We also present a performance evaluation of the prototype system.