高速公路上的自動駕駛車隊，將是落地較快的一種自動駕駛應用場景。為此，VISSIM 在軟件里新添了“車隊”這個編輯對象，用戶可以設(shè)置車隊允許自動編隊的條件閾值，以及車隊允許自動解散的條件閾值，從而模擬加入車隊、編隊行駛、離開車隊三種運行狀態(tài)。
對于車輛加入編隊，VISSIM 軟件僅允許有著相同駕駛行為的車輛加入車隊；
對于編隊行駛，在仿真時候，VISSIM 定義在車隊內(nèi)部，所有的車輛不能換道，同時每輛車保持相同的車距，僅提供有限的加速度變化；
如果遇到紅綠燈，車隊來不及完全通過的狀況下，車隊會自行拆散；
一旦車隊里的車輛準備離開車隊的時候（比如在高速公路里需要進入匝道，離開高速公路的時候），在 VISSIM 的交通仿真里，該車輛會提前增加與前車和與后車的跟車距離后，自行離開車隊。
07
除了VISSIM ，PTV還有更的產(chǎn)品線支持
PTV集團一直專注于做交通軟件和物流軟件，產(chǎn)品組合涵蓋了廣泛的軟件解決方案，如：Visum多模式出行規(guī)劃和宏觀交通模擬軟件；Vistro進行交通影響分析，優(yōu)化信號燈時間；Optima實時管理整體交通路網(wǎng)；Viswalk模擬和仿真行人行為；MaaS Modeller計算用戶“出行服務”商業(yè)案例的運行效果。 隨著自動駕駛技術(shù)的發(fā)展，PTV軟件組合也不斷拓展，以應用于自動駕駛的諸多場景。
08
PTV產(chǎn)品和IT巨頭的仿真平臺是合作關(guān)系
目前有很多IT企業(yè)進入仿真領(lǐng)域，通常利用算法來虛擬交通流數(shù)據(jù)。這種虛擬交通數(shù)據(jù)是用特定的、定義明確的障礙物和交通信號人工創(chuàng)建的，與真實的交通狀況相比，這些數(shù)據(jù)的真實性和復雜性不高。PTV具有大量來自于真實交通流的數(shù)據(jù)、模型及算法，可以彌補他們的不足。實際上，PTV產(chǎn)品已經(jīng)被多家IT巨頭的仿真平臺采用。
對于自動駕駛來說，解決自動駕駛車輛和其他道路使用者之間的交互仍然是一個挑戰(zhàn)。現(xiàn)有的仿真器較少考慮雙方的相互作用。舉例來說，在Apollo仿真平臺中實現(xiàn)了兩種類型的非車輛交通參與者：行人和騎行者。然而，這些非車輛代理的行為是預先定義的，因此它們不能實時地對車輛做出反應。雖然在CARLA 中引入了動態(tài)行人，但是車輛與行人之間的交互是以一種簡單的預先的方式進行處理：行人在移動之前會查看附近是否有車輛，然后在沒有進一步檢查的情況下繼續(xù)移動，這種交互模式還過于簡單，需要再深入研究。
為了逼近真實交通場景，自動駕駛仿真需要給大量參與車輛和其他道路使用者提供交互能力時，算力成為瓶頸，尤其是在進行大規(guī)模仿真時。要解決這些挑戰(zhàn)，PTV將與產(chǎn)業(yè)鏈各環(huán)節(jié)合作伙伴一起，共同推動自動駕駛仿真技術(shù)的發(fā)展，加快自動駕駛的落地進程。
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