A vehicle on-board weighing system should be tested on an incline of what degree?

The vehicle on-board weighing system should be tested on an incline of approximately 5 degrees because this angle is considered representative of real-world conditions that vehicles may encounter. Testing at this incline helps ensure that the system accurately measures weight without the influence of excessive gravitational variation that could occur at steeper angles. A 5-degree incline strikes a balance between being realistic and not overly complicating the testing process.

Moreover, testing at this angle allows for a good assessment of the system's ability to compensate for weight shifts due to incline without introducing significant error. Steeper inclines may lead to more pronounced changes in weight distribution and handling dynamics, potentially skewing the accuracy of the measurements during testing. Thus, maintaining an incline of around 5 degrees ensures that the system's verification process remains efficient and reliable while simulating common driving conditions.