Closed operating space means there is a restriction to the drivers target path of travel lane positions line of sight

 Line of sight

Explanation:

Line of sight is the straight line path which a driver follows by observing without any obstruction .Closed operating space is the area where hindrance is created for an driver in terms of the line of sight.He/she cannot property observe the line of sight during such situation.

Other options are incorrect because target is the goal of driver, travelling route and position of the lane are not the factor that act in closed operating space of any vehicle's driver.Thus, line of sight is the correct answer.

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