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Omron FL-DR90DF  

Omron FL-DR90DF

提供大量隨機的選擇可能，充分反映交通運行的真實

交通運行本身包含了很多的隨機，今天這條道路上同一時段運行的車輛分布和明天這條道路上同一時段運行的車輛分布不完全相同。為此，VISSIM 軟件本身提供了大量的隨機因素可以反映到軟件的仿真運行里：

比如車輛輸入的泊松分布（就是在一定的時間內(nèi)，車輛進入路網(wǎng)有著隨機，不是統(tǒng)一一起進入的）；

車輛類型在比例范圍內(nèi)的隨機出現(xiàn)；

速度和加速度選擇是從一個區(qū)間內(nèi)隨機選擇；

停留時間是從一個區(qū)間內(nèi)隨機選擇等等。

近年來，針對自動駕駛客戶的研究需要，VISSIM 軟件還為車企特別開發(fā)了在路網(wǎng)里隨機生成一些駕駛錯誤的現(xiàn)象，錯誤出現(xiàn)的比例由用戶設(shè)定，至于錯誤行為出現(xiàn)在哪條路段的哪個地方，VISSIM 可以隨機生成，比如一些駕駛員誤判交通標(biāo)志和信號控制方案的現(xiàn)象、駕駛員超速的現(xiàn)象、行駛時偏離中心線的現(xiàn)象、注意力不集中的現(xiàn)象。 以上提到的這些隨機的選擇可能，可以提供給用戶豐富的手段，來搭建各種甚至是極端的需要測試的交通流測試環(huán)境，而這些極端的場景恰恰在真實的世界里是不能隨意測試的。

05

支持機動車和非機動車混行模擬的交通流仿真軟件

車輛在道路上的駕駛行為一般分為三種：跟車行為，變道行為，橫向超車行為。

在真實世界里，車輛在行駛過程中，前、后車有跟車行為，在行駛中前、后兩輛車之間的距離是在動態(tài)調(diào)整的，由后一輛車的司機隨時修正的。德國 Wiedemann 教授提出 Car following 跟馳模型，把跟車行為又細分為自由、逼近、跟隨、剎車四種狀態(tài)。

橫向超車行為是指在中國很多城市，普遍存在小汽車和自行車、助動車在同一車道超車的現(xiàn)象，需要在交通仿真工具里體現(xiàn)出來。與其他的交通流仿真軟件相比，VISSIM 是目前可以實現(xiàn)這個功能的軟件。

對于三種駕駛行為，VISSIM 提供了對應(yīng)的 Car following 跟車模型、變道模型和橫向超車行為模型，在軟件里可以模擬駕駛行為。通過對應(yīng)的駕駛行為編輯窗口，用戶可以修改參數(shù)來輸入符合當(dāng)?shù)亟煌{駛狀況的距離等參數(shù)。

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