以雷達偵測車輛數並估算車行速度是了解路況的新技術。傳統流程為判定車輛進出雷達偵測範圍之時點，並且在車輛離開後，判斷車輛所經車道、車種及車速。當多台車同時經過偵測範圍時，及早判斷是有必要的。本論文提出於車輛離開偵測範圍前，便判斷車輛所經車道、車種及其車速之新方法，並以實際數據驗證傳統方法與新方法於判斷各種車況時之準確度。新方法相較於傳統方法損失一些準確度，但下判斷之時點卻提早甚多，因而有機會能隨時偵知在哪個車道上有哪種車輛以多快的速度行進。

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