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當司機到達高速路的人口處時，安裝在路邊的設備就會自動檢查車輛，以測定它的目的地并且確定這輛車的專有自動化設備運轉正常。
本句的主干是...devices...would*..check the vehicle...。as引導的是一個時間狀語從句；過去分詞短語installed on the roadside作定語修飾devices；兩個并列的不定式短語to detemine...和to ascertain...作主句的目的狀語；that引導的賓語從句that it had the proper...working order作ascertain的賓語。
determine在句中意為"測定，確定"，該詞還有"（使）下定決心；決定"之意。如：
They determined to go to the airport at once.
他們決定立刻去機場。
You should ascertain what services the bank is offering.
你應該查查看該銀行提供何種服務。
Language is proper to mankind.
語言是人類所特有的。
Such behavior isn't quite proper.
此等行為不甚得體。
ascertain、find、discover和detect這些動詞均有"發現"之意。
ascertain為較正式用詞，指有意查明或發現。如：
The police are trying to ascertain what really happened.
警方正設法查個水落石出。
The police found her bag.
警察找到了她的包。
Columbus is said to have discovered America in 1492.
據說哥倫布于1492年發現了美洲。
He could detect a certain sadness in her face.
他能在她臉上察覺到一絲悲傷。
