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当司机到达高速路的人口处时，安装在路边的设备就会自动检查车辆，以测定它的目的地并且确定这辆车的专有自动化设备运转正常。
本句的主干是...devices...would*..check the vehicle...。as引导的是一个时间状语从句；过去分词短语installed on the roadside作定语修饰devices；两个并列的不定式短语to detemine...和to ascertain...作主句的目的状语；that引导的宾语从句that it had the proper...working order作ascertain的宾语。
determine在句中意为"测定，确定"，该词还有"（使）下定决心；决定"之意。如：
They determined to go to the airport at once.
他们决定立刻去机场。
You should ascertain what services the bank is offering.
你应该查查看该银行提供何种服务。
Language is proper to mankind.
语言是人类所特有的。
Such behavior isn't quite proper.
此等行为不甚得体。
ascertain、find、discover和detect这些动词均有"发现"之意。
ascertain为较正式用词，指有意查明或发现。如：
The police are trying to ascertain what really happened.
警方正设法查个水落石出。
The police found her bag.
警察找到了她的包。
Columbus is said to have discovered America in 1492.
据说哥伦布于1492年发现了美洲。
He could detect a certain sadness in her face.
他能在她脸上察觉到一丝悲伤。
