本文根據高速公路路況即時資訊系統的系統設計規格，以資訊涵蓋率為限制條件 ，建立偵測車數量需求的最佳化數學規劃模式。本文探討資料封包數門檻和資訊更新週期 兩項系統參數改變，對資訊涵蓋率和偵測車發車班距產生的影響，同時針對發車班距與行 車速度的各種情境組合，推算行動數據通訊的頻寬需求。

　　　　　This paper discusses the analytical model of determination of number of probe vehicles required for superhighway real-time information system according to the system specification. We use the information coverage rate as constraint to determine the optimal probe vehicle headway. We observe the variations of coverage rate and headway based on different sample sizes and information refresh cycles. And the radio bandwidth required for those situations are also proposed.