During my early years of motor trade experience working at Renault, the new car PDI would have many tasks to complete, headlamp aims were one of them. The modern way seems to rely on the factory settings being regarded as correct and so often we see beams all over the place, not least the horizontal setting, these factors are found during a car's 1st mot. We are figting a losing battle with this though as the ligts are set with no driver on board, and tyres that have varied tread depths, meaning the car will eventually get new tyres. This will alter the alignment dependant on which tyres get replaced and variable loads applied to the vehicle by the driver. The tests that I do are often the 1st one, and cars with the beam requirements above 850mm are set to that of cars lower than 850mm, meaning a dazzle is most likely to happen to oncomming drivers and ones where the beams are aimed at the rooflining of the car in front of it.
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